Fulton Financial (FULT) 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 30, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	0-10587
Entity Registrant Name	FULTON FINANCIAL CORP
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-2195389
Entity Address, Address Line One	One Penn Square
Entity Address, City or Town	Lancaster,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	17602
City Area Code	717
Local Phone Number	291-2411
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		162,250,000
Entity Central Index Key	0000700564
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock, par value $2.50
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $2.50
Trading Symbol	FULT
Security Exchange Name	NASDAQ
Depositary Shares, Each Representing 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A*
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, Each Representing 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A*
Trading Symbol	FULTP
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 139,304	$ 132,283
Interest-bearing deposits with other banks	1,395,586	385,508
Cash and cash equivalents	1,534,890	517,791
FRB and FHLB stock	93,964	97,422
Loans held for sale	93,621	37,828
AFS, at estimated fair value	2,793,480	2,497,537
HTM, at amortized cost	304,241	369,841
Loans	19,028,621	16,837,526
Less: ACL - loans	(266,825)	(163,622)
Net Loans	18,761,796	16,673,904
Premises and equipment	236,943	240,046
Accrued interest receivable	70,766	60,898
Goodwill and intangible assets	534,907	535,303
Other assets	1,118,673	855,470
Total Assets	25,543,281	21,886,040
LIABILITIES
Noninterest-bearing	6,378,077	4,453,324
Interest-bearing	14,351,974	12,940,589
Total Deposits	20,730,051	17,393,913
Short-term borrowings	611,727	883,241
Accrued interest payable	9,123	8,834
Other liabilities	506,107	376,107
Federal Home Loan Bank advances and long-term debt	1,296,012	881,769
Total Liabilities	23,153,020	19,543,864
SHAREHOLDERS’ EQUITY
Common stock, $2.50 par value, 600 million shares authorized, 223.1 million shares issued in 2020 and 222.4 million issued in 2019	557,718	556,110
Additional paid-in capital	1,505,730	1,499,681
Retained earnings	1,099,684	1,079,391
Accumulated other comprehensive gain (loss)	56,954	(137)
Treasury stock, at cost, 61.0 million shares in 2020 and 58.3 million shares in 2019	(829,825)	(792,869)
Total Shareholders’ Equity	2,390,261	2,342,176
Total Liabilities and Shareholders’ Equity	$ 25,543,281	$ 21,886,040

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	223,100,000	222,400,000
Treasury stock, shares (in shares)	61,000,000	58,300,000

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
INTEREST INCOME
Loans, including fees	$ 158,804	$ 186,001	$ 493,256	$ 558,055
Investment securities:
Taxable	13,150	15,565	44,615	46,935
Tax-exempt	5,449	3,673	15,481	10,222
Loans held for sale	728	466	1,557	1,056
Other interest income	1,028	2,709	4,324	6,879
Total Interest Income	179,159	208,414	559,233	623,147
INTEREST EXPENSE
Deposits	14,631	35,737	58,189	97,974
Short-term borrowings	370	4,156	4,960	12,200
Long-term borrowings	10,042	7,260	28,468	23,854
Total Interest Expense	25,043	47,153	91,617	134,028
Net Interest Income	154,116	161,260	467,616	489,119
Provision for credit losses	7,080	2,170	70,680	12,295
Net Interest Income After Provision for Credit Losses	147,036	159,090	396,936	476,824
NON-INTEREST INCOME
Non-interest income before investment securities gains	63,246	55,321	170,761	156,147
Investment securities gains, net	2	4,492	3,053	4,733
Total Non-Interest Income	63,248	59,813	173,814	160,879
NON-INTEREST EXPENSE
Salaries and employee benefits	79,227	78,211	240,467	234,959
Net occupancy	13,221	12,368	39,851	39,746
Data processing and software	12,285	11,590	36,123	33,211
Other outside services	7,617	12,163	23,098	31,774
Professional fees	2,879	3,331	10,412	10,261
Equipment	3,711	3,459	10,322	10,100
State taxes	2,692	2,523	8,583	7,005
FDIC insurance	1,578	239	6,519	5,603
Marketing	1,147	3,322	4,029	8,345
Amortization of TCI	1,694	1,533	4,594	4,516
Intangible amortization	132	1,071	397	1,285
Prepayment penalty on FHLB advances	0	4,326	2,878	4,326
Other	12,962	12,634	37,431	37,631
Total Non-Interest Expense	139,147	146,770	424,705	428,762
Income Before Income Taxes	71,137	72,133	146,045	208,941
Income taxes	9,529	10,025	18,832	30,391
Net Income	$ 61,607	$ 62,108	$ 127,213	$ 178,550
PER SHARE:
Net Income (Basic) (in dollars per share)	$ 0.38	$ 0.38	$ 0.78	$ 1.06
Net Income (Diluted) (in dollars per share)	0.38	0.37	0.78	1.06
Cash Dividends (in dollars per share)	$ 0.13	$ 0.13	$ 0.39	$ 0.39
Investment management and trust services
NON-INTEREST INCOME
Non-interest income before investment securities gains	$ 14,943	$ 13,867	$ 43,405	$ 41,259
Other service charges and fees
NON-INTEREST INCOME
Non-interest income before investment securities gains	18,311	18,788	53,477	53,055
Service charges on deposit accounts
NON-INTEREST INCOME
Non-interest income before investment securities gains	10,423	13,333	30,800	37,077
Mortgage banking income
NON-INTEREST INCOME
Non-interest income before investment securities gains	16,801	6,658	32,998	18,023
Other
NON-INTEREST INCOME
Non-interest income before investment securities gains	$ 2,769	$ 2,675	$ 10,080	$ 6,733

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 61,607	$ 62,108	$ 127,213	$ 178,550
Other Comprehensive Income, net of tax:
Unrealized gain on securities	4,333	18,029	56,186	63,244
Amortization of net unrealized losses on available for sale securities transferred to held to maturity	928	3,430	2,517	5,425
Non-credit related unrealized loss on other-than-temporarily impaired debt securities	0	0	0	(682)
Amortization of net unrecognized pension and postretirement income	255	277	765	843
Other Comprehensive Income	5,515	18,238	57,091	65,144
Total Comprehensive Income	$ 67,122	$ 80,346	$ 184,304	$ 243,694

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock, par value $2.50	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2018	$ 2,247,573	$ 554,377	$ 1,489,703	$ 946,032	$ (59,063)	$ (683,476)
Beginning Balance (in shares) at Dec. 31, 2018		170,184
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	178,550			178,550
Other comprehensive income	65,144				65,144
Stock issued (in shares)		701
Stock issued	3,813	$ 1,511	1,496			806
Stock-based compensation awards (in shares)
Stock-based compensation awards	5,458		5,458
Acquisition of treasury stock (in shares)		(6,849)
Acquisition of treasury stock (in shares)	(111,457)					(111,457)
Common stock cash dividends	(65,065)			(65,065)
Ending Balance at Sep. 30, 2019	2,324,016	$ 555,888	1,496,657	1,059,517	6,081	(794,127)
Ending Balance (in shares) at Sep. 30, 2019		164,036
Beginning Balance at Jun. 30, 2019	2,308,798	$ 555,690	1,493,628	1,018,736	(12,157)	(747,099)
Beginning Balance (in shares) at Jun. 30, 2019		166,903
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	62,108			62,108
Other comprehensive income	18,238				18,238
Stock issued (in shares)		157
Stock issued	2,160	$ 198	919			1,043
Stock-based compensation awards (in shares)
Stock-based compensation awards	2,110		2,110
Acquisition of treasury stock (in shares)		(3,024)
Acquisition of treasury stock (in shares)	(48,071)					(48,071)
Common stock cash dividends	(21,327)			(21,327)
Ending Balance at Sep. 30, 2019	2,324,016	$ 555,888	1,496,657	1,059,517	6,081	(794,127)
Ending Balance (in shares) at Sep. 30, 2019		164,036
Beginning Balance at Dec. 31, 2019	2,342,176	$ 556,110	1,499,681	1,079,391	(137)	(792,869)
Beginning Balance (in shares) at Dec. 31, 2019		164,218
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	127,213			127,213
Other comprehensive income	57,091				57,091
Stock issued (in shares)		824
Stock issued	5,046	$ 1,608	646			2,792
Stock-based compensation awards (in shares)
Stock-based compensation awards	5,403		5,403
Acquisition of treasury stock (in shares)		(2,908)
Acquisition of treasury stock (in shares)	(39,748)					(39,748)
Common stock cash dividends	(63,113)			(63,113)
Ending Balance at Sep. 30, 2020	2,390,261	$ 557,718	1,505,730	1,099,684	56,954	(829,825)
Ending Balance (in shares) at Sep. 30, 2020		162,134
Beginning Balance at Jun. 30, 2020	2,340,501	$ 557,569	1,503,750	1,059,160	51,439	(831,417)
Beginning Balance (in shares) at Jun. 30, 2020		161,958
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	61,607
Other comprehensive income	5,515				5,515
Stock issued (in shares)		176
Stock issued	1,846	$ 149	105			1,592
Stock-based compensation awards (in shares)
Stock-based compensation awards	1,875		1,875
Common stock cash dividends	(21,083)			(21,083)
Ending Balance at Sep. 30, 2020	$ 2,390,261	$ 557,718	$ 1,505,730	$ 1,099,684	$ 56,954	$ (829,825)
Ending Balance (in shares) at Sep. 30, 2020		162,134

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends per share	$ 0.13	$ 0.13	$ 0.39	$ 0.39

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 127,213	$ 178,550
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	70,680	12,295
Depreciation and amortization of premises and equipment	21,653	20,984
Amortization of TCI	22,883	24,608
Net amortization of investment securities premiums	8,722	6,861
Investment securities gains, net	(3,053)	(4,733)
Gain on sales of mortgage loans held for sale	(42,208)	(13,822)
Proceeds from sales of mortgage loans held for sale	1,113,671	672,314
Originations of mortgage loans held for sale	(1,127,256)	(665,338)
Amortization of intangible assets	397	1,285
Amortization of issuance costs and discounts on long-term debt	836	632
Stock-based compensation	5,403	5,458
Other changes, net	(169,447)	(195,560)
Total adjustments	(97,719)	(135,016)
Net cash provided by operating activities	29,494	43,534
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of AFS securities	215,150	697,634
Proceeds from principal repayments and maturities of HTM securities	67,268	62,320
Proceeds from principal repayments and maturities of securities AFS	282,832	169,380
Purchase of AFS securities	(728,937)	(838,634)
Sale (purchase) of FRB and FHLB stock	3,458	(15,274)
Net increase in loans	(2,203,974)	(529,974)
Net change in tax credit investments	(18,550)	(23,799)
Net cash paid for acquisition	0	(3,907)
Net change in tax credit investments	9,585	14,715
Net cash used in investing activities	(2,392,338)	(496,969)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	3,669,990	627,958
Net (decrease) increase in time deposits	(333,852)	338,600
Net (decrease) increase in short-term borrowings	(271,514)	78,083
Additions to long-term debt	495,898	305,000
Repayments of long-term debt	(82,491)	(571,197)
Net proceeds from issuance of common stock	5,046	3,813
Dividends paid	(63,387)	(64,439)
Acquisition of treasury stock	(39,748)	(111,457)
Net cash provided by financing activities	3,379,942	606,361
Net Increase in Cash and Cash Equivalents	1,017,099	152,926
Cash and Cash Equivalents at Beginning of Period	517,791	445,687
Cash and Cash Equivalents at End of Period	1,534,890	598,613
Cash paid during the period for:
Interest	91,328	134,935
Income taxes	12,118	7,966
Supplemental schedule of certain noncash activities:
Transfer of HTM securities to AFS securities	$ 0	$ 158,898

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Consolidated Financial Statements of the Corporation have been prepared in conformity with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as revenues and expenses during the period. Actual results could differ from those estimates. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the notes thereto included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2019. Operating results for the three and nine months ended September 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. The Corporation evaluates subsequent events through the date of filing of this Form 10-Q with the SEC. CECL Adoption and Updated Significant Accounting Policy On January 1, 2020, the Corporation adopted ASU 2016-13, Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments, which replaces the incurred loss methodology, and is referred to as CECL. The measurement of expected credit losses under CECL is applicable to financial assets measured at amortized cost, including loans and HTM debt securities. It also applies to OBS credit exposures, such as loan commitments, standby letters of credit, financial guarantees, and other similar instruments, and net investments in leases recognized by a lessor in accordance with ASC Topic 842. The Corporation adopted CECL using the modified retrospective method for all financial assets measured at amortized cost, net of investments in leases and OBS credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under CECL, while prior period results are reported in accordance with the previously applicable incurred loss methodology. The Corporation recorded an increase of $58.3 million to the ACL on January 1, 2020 as a result of the adoption of CECL. Retained earnings decreased $43.8 million and deferred tax assets increased by $12.4 million. Included in the $58.3 million increase to the ACL was $2.1 million for certain OBS credit exposures that was previously recognized in other liabilities before the adoption of CECL. Loans : Loans are stated at their principal amount outstanding, except for mortgage loans held for sale, which are carried at fair value. Interest income on loans is accrued as earned. Unearned income on lease financing receivables is recognized on a basis which approximates the effective yield method. In general, loans are placed on non-accrual status once they become 90 days delinquent as to principal or interest. In certain cases a loan may be placed on non-accrual status prior to being 90 days delinquent if there is an indication that the borrower is having difficulty making payments, or the Corporation believes it is probable that all amounts will not be collected according to the contractual terms of the loan agreement. When interest accruals are discontinued, unpaid interest previously credited to income is reversed. Non-accrual loans may be restored to accrual status when all delinquent principal and interest has been paid currently for six consecutive months or the loan is considered secured and in the process of collection. The Corporation generally applies payments received on non-accruing loans to principal until such time as the principal is paid off, after which time any payments received are recognized as interest income. If the Corporation believes that all amounts outstanding on a non-accrual loan will ultimately be collected, payments received subsequent to its classification as a non-accrual loan are allocated between interest income and principal. A loan that is 90 days delinquent may continue to accrue interest if the loan is both adequately secured and is in the process of collection. Past due status is determined based on contractual due dates for loan payments. An adequately secured loan is one that has collateral with a supported fair value that is sufficient to discharge the debt, and/or has an enforceable guarantee from a financially responsible party. A loan is considered to be in the process of collection if collection is proceeding through legal action or through other activities that are reasonably expected to result in repayment of the debt or restoration to current status in the near future. Loans deemed to be a loss are written off through a charge against the ACL. Closed-end consumer loans are generally charged off when they become 120 days past due (180 days for open-end consumer loans) if they are not adequately secured by real estate. All other loans are evaluated for possible charge-off when it is probable that the balance will not be collected, based on the ability of the borrower to pay and the value of the underlying collateral, if any. Principal recoveries of loans previously charged off are recorded as increases to the ACL. Loan Origination Fees and Costs: Loan origination fees and the related direct origination costs are deferred and amortized over the life of the loan as an adjustment to interest income using the effective yield method. For mortgage loans sold, net loan origination fees and costs are included in the gain or loss on sale of the related loan, as components of mortgage banking. Loan origination fees and the related direct origination costs for loans originated under the PPP loan program are amortized on a straight-line basis over the repayment period of the loan. To the extent that a PPP loan is forgiven, the unamortized fees and costs will be recorded at the time of forgiveness. Troubled Debt Restructurings: Loans are accounted for and reported as TDRs when, for economic or legal reasons, the Corporation grants a concession to a borrower experiencing financial difficulty that it would not otherwise consider. Concessions, whether negotiated or imposed by bankruptcy, granted under a TDR typically involve a temporary deferral of scheduled loan payments, an extension of a loan’s stated maturity date or a reduction in the interest rate. Non-accrual TDRs can be restored to accrual status if principal and interest payments, under the modified terms, are current for six consecutive months after modification. On March 27, 2020 the CARES Act was signed into law. The CARES Act includes an option for financial institutions to suspend the requirements of GAAP for certain loan modifications that would otherwise be categorized as a TDR. Certain conditions must be met with respect to the loan modification including that the modification is related to COVID-19, the modified loan was not more than 30 days past due on December 31, 2019 and the modification was executed between March 1, 2020 and the earlier of (a) 60 days after the date of the COVID-19 national emergency comes to an end or (b) December 31, 2020. The Corporation is applying the option under the CARES act for all loan modifications that qualify. On April 7, 2020, Troubled Debt Restructurings: Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by COVID-19 was issued by the federal banking regulatory agencies. Included in the Interagency Statement were provisions permitting banks that grant loan modifications to customers impacted by COVID-19 to exclude those modifications from loans categorized as TDRs. The Corporation is adopting the guidance in this Interagency Statement effective for COVID-19-related modifications occurring subsequent to March 13, 2020. Allowance for Credit Losses: The discussion that follows describes the methodology for determining the ACL under the CECL model that was adopted January 1, 2020. The allowance methodology for prior periods is disclosed in the Corporation’s 2019 Annual Report on Form 10-K. The Corporation has elected to exclude accrued interest receivable from the measurement of its ACL. When a loan is placed on non-accrual status, any outstanding accrued interest is reversed against interest income. Loans: The ACL for loans is an estimate of the expected losses to be realized over the life of the loans in the portfolio. The ACL is determined for two distinct categories of loans: 1) loans evaluated collectively for expected credit losses and 2) loans evaluated individually for expected credit losses. Loans Evaluated Collectively : Loans evaluated collectively for expected credit losses include loans on accrual status, excluding accruing TDRs, and loans initially evaluated individually, but determined not to have enhanced credit risk characteristics. This category includes loans on non-accrual status and TDRs where the total commitment amount is less than $1 million. The ACL is estimated by applying a probability of default (PD) and loss given default (LGD) to the exposure at default (EAD) at the loan or lease level. In order to determine the PD, LGD, and EAD inputs: • Loans are aggregated into pools based on similar risk characteristics. • The PD and LGD model components are determined based on loss estimates driven by historical credit loss experience for each pool of loans. • The PD model components use econometric regression models that use the Corporation’s historical credit loss experience and economic variable inputs to estimate a PD for each loan pool. The LGD model component calculates a lifetime LGD estimate across each pool of loans utilizing a loss rate approach based on the Corporation’s historical charge-off and the balance at the time of loan default adjusted for the Corporation’s recovery experience. • Reasonable and supportable economic variable forecasts are incorporated into the PD model components. • Reasonable and supportable forecast periods are based on different economic forecasts and scenarios sourced from an external third party. A future loss forecast over the reasonable and supportable forecast period is based on the projected performance of specific economic variables that statistically correlate loss experience in the various loan pools. • After the reasonable and supportable forecast period, economic variable forecasts naturally revert, at the input level,to a long-run average. • To calculate the EAD model component, cash flow assumptions are established for each loan using maturity date, amortization schedule and interest rate. In addition, a constant prepayment rate is calculated for each loan pool. Loans Evaluated Individually : Loans evaluated individually for expected credit losses include loans on non-accrual status and TDRs where the commitment amount equals or exceeds $1.0 million. The required ACL for such loans is determined using either the present value of expected future cash flows, observable market price or the fair value of collateral. Loans evaluated individually may have specific allocations assigned if the measured value of the loan using one of the noted techniques is less than its current carrying value. For loans measured using the fair value of collateral, if the analysis determines that sufficient collateral value would be available for repayment of the debt, then no allocations would be assigned to those loans. Collateral could be in the form of real estate or business assets, such as accounts receivable or inventory, in the case of commercial and industrial loans. Commercial and industrial loans may also be secured by real estate. For loans secured by real estate, estimated fair values are determined primarily through appraisals performed by third-party appraisers, discounted to arrive at expected net sale proceeds. For collateral dependent loans, estimated real estate fair values are also net of estimated selling costs. When a real estate secured loan is impaired, a decision is made regarding whether an updated appraisal of the real estate is necessary. This decision is based on various considerations, including: the age of the most recent appraisal; the loan-to-value ratio based on the original appraisal; the condition of the property; the Corporation’s experience and knowledge of the real estate market; the purpose of the loan; market factors; payment status; the strength of any guarantors; and the existence and age of other indications of value such as broker price opinions, among others. The Corporation generally obtains updated appraisals performed by third-party appraisers for impaired loans secured predominantly by real estate every 12 months. When updated appraisals are not obtained for loans secured by real estate, fair values are estimated based on the original appraisal values, as long as the original appraisal indicated an acceptable loan-to-value position and there has not been a significant deterioration in the collateral value since the original appraisal was performed. For loans with principal balances greater than or equal to $1.0 million secured by non-real estate collateral, such as accounts receivable or inventory, estimated fair values are determined based on borrower financial statements, inventory listings, accounts receivable agings or borrowing base certificates. Indications of value from these sources are generally discounted based on the age of the financial information or the quality of the assets. Liquidation or collection discounts are applied to these assets based upon existing loan evaluation policies. Management regularly reviews loans in the portfolio to assess credit quality indicators and to determine appropriate loan classification. For commercial loans, commercial mortgages and construction loans to commercial borrowers, an internal risk rating process is used. The Corporation believes that internal risk ratings are the most relevant credit quality indicator for these types of loans. The migration of loans through the various internal risk rating categories is a significant component of the ACL methodology for these loans, which bases the PD on this migration. Assigning risk ratings involves judgment. Risk ratings may be changed based on ongoing monitoring procedures, or if specific loan review assessments identify a deterioration or an improvement in the loan. The following is a summary of the Corporation's internal risk rating categories: • Pass : These loans do not currently pose undue credit risk and can range from the highest to average quality, depending on the degree of potential risk. • Special Mention : These loans have a heightened credit risk, but not to the point of justifying a classification of Substandard. Loans in this category are currently acceptable, but are nevertheless potentially weak. • Substandard or Lower : These loans are inadequately protected by current sound worth and paying capacity of the borrower. There exists a well-defined weakness or weaknesses that jeopardize the normal repayment of the debt. The allocation of the ACL is reviewed to evaluate its appropriateness in relation to the overall risk profile of the loan portfolio. The Corporation considers risk factors such as: local and national economic conditions; trends in delinquencies and non-accrual loans; the diversity of borrower industry types; and the composition of the portfolio by loan type. Qualitative and Other Adjustments to ACL: In addition to the quantitative credit loss estimates for loans evaluated collectively, qualitative factors that may not be fully captured in the quantitative results are also evaluated. These qualitative factors include changes in lending policy, the nature and volume of the portfolio, overall business conditions in the economy, credit concentrations, specific industry risks, competition, model imprecision and legal and regulatory requirements. Qualitative adjustments are judgmental and are based on management’s knowledge of the portfolio and the markets in which the Corporation operates. Qualitative adjustments are evaluated and approved on a quarterly basis. Additionally, the ACL includes other allowance categories that are not directly incorporated in the quantitative results. These categories include but are not limited to loans-in-process, trade acceptances and overdrafts. OBS Credit Exposures: The ACL for OBS credit exposures is recorded in other liabilities on the consolidated balance sheets. This portion of the ACL represents management’s estimate of expected losses in its unfunded loan commitments and other OBS credit exposures. The ACL specific to unfunded commitments is determined by estimating future draws and applying the expected loss rates on those draws. Future draws are based on historical averages of utilization rates (i.e., the likelihood of draws taken). The ACL for OBS credit exposures is increased or decreased by charges or reductions to expense, through the provision for credit losses. HTM Debt Securities: Expected credit losses on HTM debt securities would be recorded in the ACL on HTM debt securities. As of September 30, 2020, no HTM debt securities required an ACL as these investments consist solely of government guaranteed residential mortgage-backed securities. AFS Debt Securities : The ACL approach for AFS debt securities differs from the CECL approach used for HTM debt securities as AFS debt securities are carried at fair value rather than amortized cost. Prior to the adoption of CECL, credit losses on AFS debt securities were determined using an OTTI approach. Under CECL, the concept of OTTI has been eliminated, but the general approach to determining credit losses is largely consistent with the OTTI method. Under CECL, credit losses on AFS debt securities are recognized through an ACL rather than through a direct write-down of the security. As of September 30, 2020, no AFS debt securities required an ACL. Other Recently Adopted Accounting Standards On January 1, 2020, the Corporation adopted ASC Update 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This update changes the fair value measurement disclosure requirements of ASC Topic 820 "Fair Value Measurement." Among other things, the update modifies the disclosure objective paragraphs of ASC 820 to eliminate: (1) "at a minimum" from the phrase "an entity shall disclose at a minimum;" and (2) other similar disclosure requirements to promote the appropriate exercise of discretion by entities. The Corporation adopted this standards update effective with its March 31, 2020 quarterly report on Form 10-Q and it did not have a material impact on its consolidated financial statements. On January 1, 2020, the Corporation adopted ASC Update 2018-15 - Intangibles - Goodwill and Other - Internal-Use Software (Topic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This update requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in ASC Subtopic 350-40 to determine which implementation costs to capitalize as assets. The Corporation adopted this standards update effective with its March 31, 2020 quarterly report on Form 10-Q and it did not have a material impact on its consolidated financial statements In March 2020, the Corporation adopted ASC Update 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This standards update provided optional guidance for a limited time to ease the potential burden in accounting for reference rate reform, specific to those using LIBOR or another reference rate expected to be discontinued due to this reform. The Corporation adopted this standards update effective with its March 31, 2020 quarterly report on Form 10-Q and it did not have a material impact on its consolidated financial statements. Recently Issued Accounting Standards Standard Description Date of Anticipated Adoption Effect on Financial Statements ASC Update 2018-14 Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans This update amends ASC Topic 715-20 to add, remove, and clarify disclosure requirements related to defined benefit pension and other postretirement plans. Fiscal Year 2020 The Corporation intends to adopt this standards update effective with its December 31, 2020 annual report on Form 10-K. This standard will impact the Corporation's disclosure relating to employee benefit plans, but the Corporation does not expect the adoption of this update to have a material impact on the consolidated financial statements. ASC Update 2019-12 Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes This update simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. First Quarter 2021 The Corporation intends to adopt this standards update effective with its March 31, 2021 quarterly report on Form 10-Q. This update is not expected to have a material impact on the consolidated financial statements. Reclassifications

Restrictions on Cash and Cash E

Restrictions on Cash and Cash Equivalents	9 Months Ended
	Sep. 30, 2020
Cash and Cash Equivalents [Abstract]
Restrictions on Cash and Cash Equivalents	Restrictions on Cash and Cash EquivalentsThe Bank is required to maintain reserves against its deposit liabilities. Prior to March 2020, reserves were in the form of cash and balances with the FRB. The FRB suspended cash reserve requirements effective March 26, 2020. The amount of such reserves as of December 31, 2019 was $218.9 million. In addition, cash collateral is posted by the Corporation with counterparties to secure derivative and other contracts. The amounts of such cash collateral as of September 30, 2020 and December 31, 2019 were $460.3 million and $199.6 million, respectively.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following table presents the amortized cost and estimated fair values of investment securities for the periods presented: September 30, 2020 Amortized Gross Gross Estimated Available for Sale (in thousands) State and municipal securities $ 880,495 $ 46,216 $ (157) $ 926,554 Corporate debt securities 327,143 16,724 (1,309) 342,558 Collateralized mortgage obligations 516,312 16,207 (46) 532,473 Residential mortgage-backed securities 318,343 3,409 (57) 321,695 Commercial mortgage-backed securities 548,076 24,136 (2) 572,210 Auction rate securities 101,510 — (3,520) 97,990 Total $ 2,691,879 $ 106,692 $ (5,091) $ 2,793,480 Held to Maturity Residential mortgage-backed securities $ 304,241 $ 20,699 $ — $ 324,940 December 31, 2019 Amortized Gross Gross Estimated Available for Sale (in thousands) State and municipal securities $ 638,125 $ 15,826 $ (1,024) $ 652,927 Corporate debt securities 370,401 8,490 (1,534) 377,357 Collateralized mortgage obligations 682,307 11,726 (315) 693,718 Residential mortgage-backed securities 177,183 1,078 (949) 177,312 Commercial mortgage-backed securities 489,603 6,471 (1,777) 494,297 Auction rate securities 107,410 — (5,484) 101,926 Total $ 2,465,029 $ 43,591 $ (11,083) $ 2,497,537 Held to Maturity Residential mortgage-backed securities $ 369,841 $ 13,864 $ — $ 383,705 On July 1, 2019, the Corporation transferred state and municipal securities from the held to maturity classification to the available for sale classification as permitted through the early adoption of ASU 2019-04. The amortized cost of the securities transferred was $158.9 million and the estimated fair value was $168.5 million. Securities carried at $568.4 million at September 30, 2020 and $462.6 million at December 31, 2019 were pledged as collateral to secure public and trust deposits and customer repurchase agreements. The amortized cost and estimated fair values of debt securities as of September 30, 2020, by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities as certain investment securities are subject to call or prepayment with or without call or prepayment penalties. September 30, 2020 Available for Sale Held to Maturity Amortized Estimated Amortized Estimated (in thousands) Due in one year or less $ 11,252 $ 11,388 $ — $ — Due from one year to five years 32,118 33,397 — — Due from five years to ten years 315,094 330,233 — — Due after ten years 950,684 992,084 — — 1,309,148 1,367,102 — — Residential mortgage-backed securities (1) 318,343 321,695 304,241 324,940 Commercial mortgage-backed securities (1) 548,076 572,210 — — Collateralized mortgage obligations (1) 516,312 532,473 — — Total $ 2,691,879 $ 2,793,480 $ 304,241 $ 324,940 (1) Mortgage-backed securities and collateralized mortgage obligations do not have stated maturities and are dependent upon the interest rate environment and prepayments on the underlying loans. The following table presents information related to the gross realized gains and losses on the sales of investment securities for the periods presented: Gross Realized Gains Gross Realized Losses Net Gains Three months ended (in thousands) September 30, 2020 $ 94 $ (92) $ 2 September 30, 2019 7,938 (3,446) 4,492 Nine months ended September 30, 2020 $ 6,545 $ (3,492) $ 3,053 September 30, 2019 11,207 (6,474) 4,733 During the second quarter of 2020, the Corporation completed a limited balance sheet restructuring that included the sale of investment securities, with an amortized cost $79.0 million and an estimated fair value of $82.0 million, resulting in net investment securities gains of $3.0 million. Offsetting these gains were $2.9 million of prepayment penalties recorded in non-interest expense for the redemption of FHLB advances. During the third quarter of 2019, the Corporation completed a balance sheet restructuring that included the sale of investment securities, with an amortized cost of $409.2 million and an estimated fair value of $413.7 million, resulting in net investment securities gains of $4.5 million. Offsetting these gains were $4.3 million of prepayment penalties recorded in non-interest expense for the redemption of FHLB advances. The following tables present the gross unrealized losses and estimated fair values of investment securities, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented: September 30, 2020 Less than 12 months 12 months or longer Total Number of Securities Estimated Unrealized Number of Securities Estimated Unrealized Estimated Unrealized Available for Sale (in thousands) State and municipal securities 6 $ 25,372 $ (157) — $ — $ — $ 25,372 $ (157) Corporate debt securities 16 67,030 (965) 1 6,847 (344) 73,877 (1,309) Collateralized mortgage obligations 1 25,489 (46) — — — 25,489 (46) Residential mortgage-backed securities 4 75,876 (57) — — — 75,876 (57) Commercial mortgage-backed securities 1 9,322 (2) — — — 9,322 (2) Auction rate securities — — — 162 97,990 (3,520) 97,990 (3,520) Total available for sale (1) 28 $ 203,089 $ (1,227) 163 $ 104,837 $ (3,864) $ 307,926 $ (5,091) December 31, 2019 Less than 12 months 12 months or longer Total Number of Securities Estimated Unrealized Number of Securities Estimated Unrealized Estimated Unrealized Available for Sale (in thousands) State and municipal securities 44 $ 136,344 $ (1,024) — $ — $ — $ 136,344 $ (1,024) Corporate debt securities 5 30,719 (346) 8 18,759 (1,188) 49,478 (1,534) Collateralized mortgage obligations 5 33,865 (190) 1 5,330 (125) 39,195 (315) Residential mortgage-backed securities 5 12,247 (40) 26 127,373 (909) 139,620 (949) Commercial mortgage-backed securities 7 121,340 (1,777) — — — 121,340 (1,777) Auction rate securities — — — 177 101,926 (5,484) 101,926 (5,484) Total available for sale (1) 66 $ 334,515 $ (3,377) 212 $ 253,388 $ (7,706) $ 587,903 $ (11,083) (1) No HTM securities were in an unrealized loss position as of September 30, 2020 or December 31, 2019. The Corporation’s collateralized mortgage obligations and mortgage-backed securities have contractual terms that generally do not permit the issuer to settle the securities at a price less than the amortized cost of the investment. The change in fair value of these securities is attributable to changes in interest rates and not credit quality. The Corporation does not have the intent to sell and does not believe it will more likely than not be required to sell any of these securities prior to a recovery of their fair value to amortized cost. Therefore, the Corporation does not have an ACL for these investments as of September 30, 2020.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Loans and Allowance for Credit Losses	Allowance for Credit Losses and Asset Quality Net Loans are summarized as follows: September 30, December 31, 2019 (in thousands) Real estate - commercial mortgage $ 7,046,330 $ 6,700,776 Commercial and industrial 5,968,154 4,446,701 Real-estate - residential mortgage 3,061,835 2,641,465 Real-estate - home equity 1,222,709 1,314,944 Real-estate - construction 1,007,534 971,079 Consumer 469,551 463,164 Equipment lease financing and other 274,570 322,625 Overdrafts 1,694 3,582 Gross loans 19,052,377 16,864,336 Unearned income (23,756) (26,810) Net Loans $ 19,028,621 $ 16,837,526 The Corporation segments its loan portfolio by "portfolio segments," as presented in the table above. Certain portfolio segments are further disaggregated by "class segment" for the purpose of estimating credit losses. See "Allowance for Credit Losses" below for further discussion regarding portfolio and class segments and their impact on the determination of the ACL. Allowance for Credit Losses, effective January 1, 2020 As discussed in Note 1, "Basis of Presentation," the Corporation adopted CECL effective January 1, 2020. CECL requires estimated credit losses on loans to be determined based on an expected life of loan model, as compared to an incurred loss model (in effect for periods prior to 2020). Accordingly, ACL disclosures subsequent to January 1, 2020 are not always comparable to prior periods. In addition, certain new disclosures required under CECL are not applicable to prior periods. As a result, the following tables present disclosures separately for each period, where appropriate. New disclosures required under CECL are only shown for the current period and are noted. See Note 1, "Basis of Presentation", for a summary of the impact of adopting CECL on January 1, 2020. Under CECL, loans evaluated individually for impairment consist of non-accrual loans and TDRs. Under the incurred loss model in effect prior to the adoption of CECL, loans evaluated individually for impairment were referred to as impaired loans. The ACL related to loans consists of loans evaluated collectively and individually for expected credit losses. The ACL related to loans represents an estimate of expected credit losses over the expected life of the loans as of the balance sheet date and is recorded as a reduction to Net Loans. The ACL for OBS credit exposures includes estimated losses on unfunded loan commitments, letters of credit and other OBS credit exposures. The total ACL is increased by charges to expense, through the provision for credit losses, and decreased by charge-offs, net of recoveries. The following table presents the components of the ACL under CECL: September 30, 2020 (in thousands) ACL - loans $ 266,825 ACL - OBS credit exposure 15,533 Total ACL $ 282,358 The following table presents the activity in the ACL in 2020: Three months ended September 30, 2020 Nine months ended September 30, 2020 (in thousands) Balance at beginning of period $ 272,920 $ 166,209 Impact of adopting CECL on January 1, 2020 (1) — 58,348 Loans charged off (5,489) (27,539) Recoveries of loans previously charged off 7,847 14,660 Net loans recovered (charged off) 2,358 (12,879) Provision for credit losses (2) 7,080 70,680 Balance at end of period $ 282,358 $ 282,358 (1) Includes $12.6 million of reserves for OBS credit exposures as of January 1, 2020. (2) Includes $850,000 and $320,000 related to OBS credit exposures for the three and nine months ended September 30, 2020, respectively. The following table presents the activity in the ACL - loans by portfolio segment, for the three and nine months ended September 30, 2020: Real Estate - Commercial and Real Estate - Real Estate - Real Estate - Consumer Equipment lease financing, other Total (in thousands) Three months ended September 30, 2020 Balance at June 30, 2020 $ 102,695 $ 61,447 $ 16,391 $ 46,443 $ 12,314 $ 10,299 $ 6,948 $ 256,537 Loans charged off (746) (2,969) (393) (198) — (701) (483) (5,489) Recoveries of loans previously charged off 100 2,103 44 95 4,873 447 185 7,847 Net loans recovered (charged off) (646) (866) (349) (103) 4,873 (254) (298) 2,358 Provision for loan losses (1) 9,806 (1,743) 256 2,013 (2,177) 260 (484) 7,930 Balance at September 30, 2020 $ 111,855 $ 58,838 $ 16,298 $ 48,353 $ 15,010 $ 10,305 $ 6,166 $ 266,825 Nine months ended September 30, 2020 Balance at December 31, 2019 $ 45,610 $ 68,602 $ 17,744 $ 19,771 $ 4,443 $ 3,762 $ 3,690 $ 163,622 Impact of adopting CECL on January 1, 2020 29,361 (18,576) (65) 21,235 4,015 5,969 3,784 45,723 Loans charged off (3,925) (17,348) (1,138) (620) (17) (2,788) (1,704) (27,539) Recoveries of loans previously charged off 439 6,815 305 292 4,943 1,481 385 14,660 Net loans recovered (charged off) (3,486) (10,533) (833) (328) 4,926 (1,307) (1,319) (12,879) Provision for loan losses (1) 40,370 19,345 (548) 7,675 1,626 1,881 11 70,359 Balance at September 30, 2020 $ 111,855 $ 58,838 $ 16,298 $ 48,353 $ 15,010 $ 10,305 $ 6,166 $ 266,825 (1) Provision included in the table only includes the portion related to Net Loans. The higher provision during the first nine months of 2020 was largely driven by the overall downturn in economic forecasts due to COVID-19, resulting in higher expected future credit losses under CECL. The ACL includes qualitative adjustments, as appropriate, intended to capture the impact of uncertainties not reflected in the quantitative models. Qualitative adjustments include and consider changes in international, national, regional and local economic and business conditions, an assessment of the lending environment, including underwriting standards and other factors affecting credit quality. Qualitative adjustments used in determining the ACL increased compared to those at the time of adoption of CECL on January 1, 2020 primarily as a result of uncertainties related to forecasted economic variables due to the economic impact of COVID-19 and the future performance of loans that received deferrals or forbearances due to COVID-19. Allowance for Credit Losses, prior to January 1, 2020 Prior to January 1, 2020, the ACL consisted of the allowance for loan losses and the reserve for unfunded lending commitments. The allowance for loan losses represented management’s estimate of incurred losses in the loan portfolio as of the balance sheet date and is recorded as a reduction to Net Loans. The reserve for unfunded lending commitments represented management’s estimate of incurred losses in unfunded loan commitments and letters of credit, and was recorded in other liabilities on the consolidated balance sheets. The ACL was increased by charges to expense, through the provision for credit losses, and decreased by charge-offs, net of recoveries. The following table presents the components of the ACL: December 31, 2019 (in thousands) Allowance for loan losses $ 163,622 Reserve for unfunded lending commitments 2,587 ACL $ 166,209 The following table presents the activity in the ACL for the periods indicated in 2019: Three months ended September 30, 2019 Nine months ended September 30, 2019 (in thousands) Balance at beginning of period $ 176,941 $ 169,410 Loans charged off (10,128) (20,208) Recoveries of loans previously charged off 3,814 11,300 Net loans charged off (6,314) (8,908) Provision for credit losses (1) 2,170 12,295 Balance at end of period $ 172,797 $ 172,797 (1) Includes ($46,000) and ($2.2 million) related to reserve for unfunded lending commitments for the three and nine months ended September 30, 2019, respectively. The following table presents the activity in the allowance for loan losses, by portfolio segment, for the three and nine months ended September 30, 2019: Real Estate - Commercial & Real Estate - Real Estate - Real Estate - Consumer Equipment lease financing, other Total (in thousands) Three months ended September 30, 2019 Balance at June 30, 2019 $ 54,859 $ 66,341 $ 18,981 $ 18,892 $ 4,928 $ 3,363 $ 2,869 $ 170,233 Loans charged off (394) (7,181) (498) (533) (45) (877) (600) (10,128) Recoveries of loans previously charged off 444 2,311 132 440 164 216 107 3,814 Net loans recovered (charged off) 50 (4,870) (366) (93) 119 (661) (493) (6,314) Provision for loan losses (1) (5,529) 7,710 (662) (109) (664) 798 672 2,216 Balance at September 30, 2019 $ 49,380 $ 69,181 $ 17,953 $ 18,690 $ 4,383 $ 3,500 $ 3,048 $ 166,135 Nine months ended September 30, 2019 Balance at December 31, 2018 $ 52,889 $ 58,868 $ 18,911 $ 18,921 $ 5,061 $ 3,217 $ 2,670 $ 160,537 Loans charged off (1,769) (11,863) (923) (1,322) (143) (2,355) (1,833) (20,208) Recoveries of loans previously charged off 749 6,234 552 783 1,493 1,005 484 11,300 Net loans recovered (charged off) (1,020) (5,629) (371) (539) 1,350 (1,350) (1,349) (8,908) Provision for loan losses (1) (2,489) 15,942 (587) 308 (2,028) 1,633 1,727 14,506 Balance at September 30, 2019 $ 49,380 $ 69,181 $ 17,953 $ 18,690 $ 4,383 $ 3,500 $ 3,048 $ 166,135 (1) The provision in the table only includes the portion related to Net Loans. Non-accrual Loans All loans individually evaluated for impairment are measured for losses on a quarterly basis. As of September 30, 2020 and December 31, 2019, substantially all of the Corporation’s individually evaluated loans with total commitments greater than or equal to $1.0 million were measured based on the estimated fair value of each loan’s collateral, if any. Collateral could be in the form of real estate, in the case of commercial mortgages and construction loans, or business assets, such as accounts receivable or inventory, in the case of commercial and industrial loans. Commercial and industrial loans may also be secured by real estate. As of both September 30, 2020 and December 31, 2019, approximately 93% of loans evaluated individually for impairment with principal balances greater than or equal to $1.0 million, whose primary collateral is real estate, were measured at estimated fair value using appraisals performed by state certified third-party appraisers that had been updated in the preceding 12 months. The following table presents total non-accrual loans, by class segment: September 30, 2020 December 31, 2019 Non-accrual Loans Non-accrual Loans With a Related Allowance Without a Related Allowance Total Total (in thousands) Real estate - commercial mortgage $ 15,145 $ 25,781 $ 40,926 $ 33,166 Commercial and industrial 14,326 20,948 35,274 48,106 Real estate - residential mortgage 23,637 1,256 24,893 16,676 Real estate - home equity 8,682 — 8,682 7,004 Real estate - construction 607 1,014 1,621 3,618 Consumer 235 — 235 — Equipment lease financing and other — 16,690 16,690 16,528 $ 62,632 $ 65,689 $ 128,321 $ 125,098 As of September 30, 2020, there were $65.7 million of non-accrual loans that did not have a related allowance for credit losses. The estimated fair values of the collateral securing these loans exceeded their carrying amount, or the loans were previously charged down to realizable collateral values. Accordingly, no specific valuation allowance was considered to be necessary. Asset Quality Maintaining an appropriate ACL is dependent on various factors, including the ability to identify potential problem loans in a timely manner. For commercial construction, residential construction, commercial and industrial, and commercial real estate, an internal risk rating process is used. The Corporation believes that internal risk ratings are the most relevant credit quality indicator for these types of loans. The migration of loans through the various internal risk categories is a significant component of the ACL methodology for these loans, under both the CECL and incurred loss models, which bases the probability of default on this migration. Assigning risk ratings involves judgment. The Corporation's loan review officers provide a separate assessment of risk rating accuracy. Risk ratings may be changed based on the ongoing monitoring procedures performed by loan officers or credit administration staff, or if specific loan review assessments identify a deterioration or an improvement in the loans. The following table summarizes designated internal risk categories by portfolio segment and loan class, by origination year, in the current period : September 30, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2020 2019 2018 2017 2016 Prior Cost Basis Cost Basis Total Real estate - construction (1) Pass $ 94,758 $ 243,614 $ 196,393 $ 138,308 $ 44,315 $ 114,228 $ 47,594 $ — $ 879,210 Special Mention — 241 — — 7,103 6,106 — — 13,450 Substandard or Lower — 448 — — 760 5,822 943 — 7,973 Total real estate - construction 94,758 244,303 196,393 138,308 52,178 126,156 48,537 — 900,633 Real estate - construction (1) Current period gross charge-offs — — — — — (17) — — (17) Current period recoveries — — — — 68 4,875 — — 4,943 Total net (charge-offs) recoveries — — — — 68 4,858 — — 4,926 Commercial and industrial Pass 2,409,273 540,493 330,516 229,184 216,228 635,782 1,256,763 — 5,618,239 Special Mention 52,203 13,653 7,618 10,886 13,693 29,919 50,673 — 178,645 Substandard or Lower 38,983 1,125 15,819 11,797 13,422 25,081 64,089 954 171,270 Total commercial and industrial 2,500,459 555,271 353,953 251,867 243,343 690,782 1,371,525 954 5,968,154 Commercial and industrial Current period gross charge-offs — (106) (10) (102) (388) (117) (16,625) — (17,348) Current period recoveries 39 364 207 91 1,704 4,410 — 6,815 Total net (charge-offs) recoveries — (67) 354 105 (297) 1,587 (12,215) — (10,533) Real estate - commercial mortgage Pass 702,768 933,999 792,029 850,926 871,759 2,381,373 88,116 327 6,621,297 Special Mention 13,247 13,505 19,298 33,245 46,354 139,832 3,502 — 268,983 Substandard or Lower 1,119 2,409 13,665 39,467 9,375 88,671 1,344 — 156,050 Total real estate - commercial mortgage 717,134 949,913 824,992 923,638 927,488 2,609,876 92,962 327 7,046,330 Real estate - commercial mortgage Current period gross charge-offs — (16) (36) (2,515) (29) (1,312) (17) — (3,925) Current period recoveries — — — — 1 438 — — 439 Total net (charge-offs) recoveries — (16) (36) (2,515) (28) (874) (17) — (3,486) Total Pass $ 3,206,799 $ 1,718,106 $ 1,318,938 $ 1,218,418 $ 1,132,302 $ 3,131,383 $ 1,392,473 $ 327 $ 13,118,746 Special Mention 65,450 27,399 26,916 44,131 67,150 175,857 54,175 — 461,078 Substandard or Lower 40,102 3,982 29,484 51,264 23,557 119,574 66,376 954 335,293 Total $ 3,312,351 $ 1,749,487 $ 1,375,338 $ 1,313,813 $ 1,223,009 $ 3,426,814 $ 1,513,024 $ 1,281 $ 13,915,117 (1) Excludes real estate - construction - other. The information presented in the table above is not required for periods prior to the adoption of CECL. The following table presents the most comparable required information for the prior period, internal credit risk ratings for the indicated loan class segments: December 31, 2019 Pass Special Mention Substandard or Lower Total (dollars in thousands) Real estate - commercial mortgage $ 6,429,407 $ 137,163 $ 134,206 $ 6,700,776 Commercial and industrial - secured 3,830,847 171,442 195,884 4,198,173 Commercial and industrial - unsecured 234,987 9,665 3,876 248,528 Total commercial and industrial 4,065,834 181,107 199,760 4,446,701 Construction - commercial residential 100,808 2,897 3,461 107,166 Construction - commercial 765,562 1,322 2,676 769,560 Total construction (excluding construction - other) 866,370 4,219 6,137 876,726 $ 11,361,611 $ 322,489 $ 340,103 $ 12,024,203 % of Total 94.5 % 2.7 % 2.8 % 100.0 % The Corporation does not assign internal risk ratings to smaller balance, homogeneous loans, such as home equity, residential mortgage, construction loans to individuals secured by residential real estate, consumer and equipment lease financing. For these loans, the most relevant credit quality indicator is delinquency status. The migration of loans through the various delinquency status categories is a significant component of the ACL methodology for those loans, under both the CECL and incurred loss models, which base the PD on this migration. The Corporation considers the performance of the loan portfolio and its impact on the ACL. For certain loans classes, the Corporation evaluates credit quality based on the aging status of the loan. The following table presents the amortized cost of these loans based on payment activity, by origination year, for the current period: September 30, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2020 2019 2018 2017 2016 Prior Cost Basis Cost Basis Total Real estate - home equity Performing $ 21,247 $ 8,297 $ 14,573 $ 12,064 $ 13,006 $ 140,145 $ 995,811 $ 5,485 $ 1,210,628 Nonperforming — — 153 256 225 2,354 8,764 329 12,081 Total real estate - home equity 21,247 8,297 14,726 12,320 13,231 142,499 1,004,575 5,814 1,222,709 Real estate - home equity Current period gross charge-offs — — — — — — (1,137) — (1,137) Current period recoveries — — — — — 123 182 — 305 Total net (charge-offs) recoveries — — — — — 123 (955) — (832) Real estate - residential mortgage Performing 953,063 649,475 268,809 383,345 294,005 484,717 — — 3,033,414 Nonperforming — 832 2,437 2,611 723 21,818 — — 28,421 Total real estate - residential mortgage 953,063 650,307 271,246 385,956 294,728 506,535 — — 3,061,835 Real estate - residential mortgage Current period gross charge-offs — (68) (101) (190) (7) (254) — — (620) Current period recoveries — — 13 1 — 278 — — 292 Total net (charge-offs) recoveries — (68) (88) (189) (7) 24 — — (328) Consumer Performing 93,208 106,797 104,984 48,281 27,828 38,319 49,594 — 469,011 Nonperforming 123 68 56 62 47 162 22 — 540 Total consumer 93,331 106,865 105,040 48,343 27,875 38,481 49,616 — 469,551 Consumer Current period gross charge-offs — (500) (425) (346) (433) (642) (442) — (2,788) Current period recoveries — 48 148 116 177 891 101 — 1,481 Total net (charge-offs) recoveries — (452) (277) (230) (256) 249 (341) — (1,307) Equipment lease financing and other Performing 69,512 71,629 53,733 39,888 18,481 6,219 — — 259,462 Nonperforming — — 190 16,054 272 286 — — 16,802 Total leasing and other 69,512 71,629 53,923 55,942 18,753 6,505 — — 276,264 Equipment lease financing and other Current period gross charge-offs (1,463) (241) — — — — — — (1,704) Current period recoveries 187 136 17 16 9 20 — — 385 Total net (charge-offs) recoveries (1,276) (105) 17 16 9 20 — — (1,319) Construction - other Performing 45,386 36,764 6,614 — 16 — 17,940 — 106,720 Nonperforming — — — 181 — — — — 181 Total construction - other 45,386 36,764 6,614 181 16 — 17,940 — 106,901 Construction - other Current period gross charge-offs — — — — — — — — — Current period recoveries — — — — — — — — — Total net (charge-offs) recoveries — — — — — — — — — Total Performing $ 1,182,416 $ 872,962 $ 448,713 $ 483,578 $ 353,336 $ 669,400 $ 1,063,345 $ 5,485 $ 5,079,235 Nonperforming 123 900 2,836 19,164 1,267 24,620 8,786 329 58,025 Total $ 1,182,539 $ 873,862 $ 451,549 $ 502,742 $ 354,603 $ 694,020 $ 1,072,131 $ 5,814 $ 5,137,260 The information presented in the table above is not required for periods prior to the adoption of CECL. The following table presents the most comparable required information for the prior period, a summary of performing, delinquent and non-performing loans for the indicated class segments: December 31, 2019 Performing Delinquent (1) Non-performing (2) Total (dollars in thousands) Real estate - home equity $ 1,292,035 $ 12,341 $ 10,568 $ 1,314,944 Real estate - residential mortgage 2,584,763 34,291 22,411 2,641,465 Construction - other 92,649 895 809 94,353 Consumer - direct 63,582 465 190 64,237 Consumer - indirect 393,974 4,685 268 398,927 Total consumer 457,556 5,150 458 463,164 Equipment lease financing and other 278,743 4,012 16,642 299,397 $ 4,705,746 $ 56,689 $ 50,888 $ 4,813,323 % of Total 97.8 % 1.2 % 1.0 % 100 % (1) Includes all accruing loans 30 days to 89 days past due. (2) Includes all accruing loans 90 days or more past due and all non-accrual loans. The following table presents non-performing assets: September 30, December 31, (in thousands) Non-accrual loans $ 128,321 $ 125,098 Loans 90 days or more past due and still accruing 13,761 16,057 Total non-performing loans 142,082 141,155 OREO (1) 4,565 6,831 Total non-performing assets $ 146,647 $ 147,986 (1) Excludes $9.6 million of residential mortgage properties for which formal foreclosure proceedings were in process as of September 30, 2020. The following tables present the aging of the amortized cost basis of loans, by class segment: 30-59 60-89 ≥ 90 Days Days Past Days Past Past Due Non- Due Due and Accruing Accrual Current Total (in thousands) September 30, 2020 Real estate – commercial mortgage $ 11,867 $ 3,702 $ 2,499 $ 40,926 $ 6,987,336 $ 7,046,330 Commercial and industrial 5,326 1,228 1,950 35,274 5,924,376 5,968,154 Real estate – residential mortgage 10,686 1,180 3,394 24,893 3,021,682 3,061,835 Real estate – home equity 3,966 902 3,070 8,682 1,206,089 1,222,709 Real estate – construction — — 2,430 1,621 1,003,483 1,007,534 Consumer 1,648 436 306 235 466,926 469,551 Equipment lease financing and other 250 110 112 16,690 235,346 252,508 Total $ 33,743 $ 7,558 $ 13,761 $ 128,321 $ 18,845,238 $ 19,028,621 30-59 Days Past 60-89 ≥ 90 Days Non- Current Total (in thousands) December 31, 2019 Real estate – commercial mortgage $ 10,912 $ 1,543 $ 4,113 $ 33,166 $ 6,651,042 $ 6,700,776 Commercial and industrial 2,302 2,630 1,385 48,106 4,392,278 4,446,701 Real estate – residential mortgage 26,982 7,309 5,735 16,676 2,584,763 2,641,465 Real estate – home equity 9,635 2,706 3,564 7,004 1,292,035 1,314,944 Real estate – construction 1,715 900 688 3,618 964,158 971,079 Consumer 4,228 922 458 — 457,556 463,164 Equipment lease financing and other 552 3,460 114 16,528 278,743 299,397 Total $ 56,326 $ 19,470 $ 16,057 $ 125,098 $ 16,620,575 $ 16,837,526 Collateral-Dependent Loans A financial asset is considered to be collateral-dependent when the debtor is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. For all classes of financial assets deemed collateral-dependent, the Corporation elected the practical expedient to estimate expected credit losses based on the collateral’s fair value less cost to sell. In most cases, the Corporation records a partial charge-off to reduce the loan’s carrying value to the collateral’s fair value less cost to sell. Substantially all of the collateral supporting collateral-dependent financial assets consists of various types of real estate including residential properties; commercial properties such as retail centers, office buildings, and lodging; agriculture land; and vacant land. Troubled Debt Restructurings The following table presents TDRs, by class segment: September 30, December 31, (in thousands) Real estate - residential mortgage $ 19,427 $ 21,551 Real estate - commercial mortgage 28,558 13,330 Real estate - home equity 14,875 15,068 Commercial and industrial 7,328 5,193 Consumer — 8 Total accruing TDRs 70,188 55,150 Non-accrual TDRs (1) 37,025 20,825 Total TDRs $ 107,213 $ 75,975 (1) Included in non-accrual loans in the preceding table detailing non-performing assets. The following table presents TDRs, by class segment, for loans that were modified during the three and nine months ended September 30, 2020 and 2019: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Real estate - residential mortgage 8 $ 1,351 1 $ 830 48 $ 10,516 6 $ 2,263 Real estate - commercial mortgage 5 8,394 1 81 12 24,868 1 81 Real estate - home equity 13 1,370 12 327 40 3,556 46 2,281 Commercial and industrial 4 3,021 3 97 18 4,399 13 4,928 Consumer 3 53 — — 11 238 — — Total 33 $ 14,189 17 $ 1,335 129 $ 43,577 66 $ 9,553 Restructured loan modifications may include payment schedule modifications, interest rate concessions, bankruptcies, principal reduction or some combination of these concessions. The restructured loan modifications primarily included maturity date extensions, rate modifications and payment schedule modifications. In accordance with regulatory guidance, payment schedule modifications granted after March 13, 2020 to borrowers impacted by the effects of the COVID-19 pandemic and who were not delinquent at the time of the payment schedule modifications have been excluded from TDRs. For the nine months ended September 30, 2020, payment schedule modifications having a recorded investment of $3.8 billion were excluded from TDRs based on this regulatory guidance.

Mortgage Servicing Rights

Mortgage Servicing Rights	9 Months Ended
	Sep. 30, 2020
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights The following table summarizes the changes in MSRs, which are included in other assets on the consolidated balance sheets: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Amortized cost: Balance at beginning of period $ 38,692 $ 38,826 $ 39,267 $ 38,573 Originations of MSRs 4,319 2,499 8,569 5,585 Amortization (4,129) (1,970) (8,954) (4,803) Balance at end of period $ 38,882 $ 39,355 $ 38,882 $ 39,355 Valuation allowance: Balance at beginning of period $ (7,700) $ — $ — $ — Additions to valuation allowance (1,500) — (9,200) — Balance at end of period $ (9,200) $ — $ (9,200) $ — Net MSRs at end of period $ 29,682 $ 39,355 $ 29,682 $ 39,355 Estimated fair value of MSRs at end of period $ 29,682 $ 43,968 $ 29,682 $ 43,968 MSRs represent the economic value of contractual rights to service mortgage loans that have been sold. The total portfolio of loans serviced by the Corporation for unrelated third parties was $4.8 billion and $4.9 billion as of September 30, 2020 and December 31, 2019, respectively. Actual and expected prepayments of the underlying mortgage loans can impact the fair values of the MSRs. The Corporation accounts for MSRs at the lower of amortized cost or fair value.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Corporation manages its exposure to certain interest rate and foreign currency risks through the use of derivatives. None of the Corporation's outstanding derivative contracts are designated as hedges, and none are entered into for speculative purposes. Derivative instruments are carried at fair value, with changes in fair value recognized in earnings as components of non-interest income or non-interest expense on the consolidated statements of income. Derivative contracts create counterparty credit risk with both the Corporation's customers and with institutional derivative counterparties. The Corporation manages counterparty credit risk through its credit approval processes, monitoring procedures and obtaining adequate collateral, when the Corporation determines it is appropriate to do so and in accordance with counterparty contracts. For each of the derivatives, gross derivative assets and liabilities are recorded in other assets and other liabilities, respectively, on the consolidated balance sheets. Related gains and losses on these derivative instruments are recorded in other changes, net on the consolidated statement of cash flows. Mortgage Banking Derivatives In connection with its mortgage banking activities, the Corporation enters into commitments to originate certain fixed-rate residential mortgage loans for customers, also referred to as interest rate locks. In addition, the Corporation enters into forward commitments for the future sales or purchases of mortgage-backed securities to or from third-party counterparties to hedge the effect of changes in interest rates on the values of both the interest rate locks and mortgage loans held for sale. Forward sales commitments may also be in the form of commitments to sell individual mortgage loans at a fixed price at a future date. The amount necessary to settle each interest rate lock is based on the price that secondary market investors would pay for loans with similar characteristics, including interest rate and term, as of the date fair value is measured. Interest Rate Swaps The Corporation enters into interest rate swaps with certain qualifying commercial loan customers to meet their interest rate risk management needs. The Corporation simultaneously enters into interest rate swaps with dealer counterparties, with identical notional amounts and terms. The net result of these interest rate swaps is that the customer pays a fixed rate of interest and the Corporation receives a floating rate. The Corporation is required to clear all eligible interest rate swap contracts with a clearing agent and is subject to the regulations of the Commodity Futures Trading Commission. Foreign Exchange Contracts The Corporation enters into foreign exchange contracts to accommodate the needs of its customers. Foreign exchange contracts are commitments to buy or sell foreign currency on a specific date at a contractual price. The Corporation limits its foreign exchange exposure with customers by entering into contracts with institutional counterparties to mitigate its foreign exchange risk. The Corporation also holds certain amounts of foreign currency with international correspondent banks ("Foreign Currency Nostro Accounts"). The Corporation limits the total overnight net foreign currency open positions, which is defined as an aggregate of all outstanding contracts and Foreign Currency Nostro Account balances, to $500,000. The following table presents a summary of the notional amounts and fair values of derivative financial instruments: September 30, 2020 December 31, 2019 Notional Asset Notional Asset (in thousands) Interest Rate Locks with Customers Positive fair values $ 446,268 $ 11,994 $ 132,260 $ 1,123 Negative fair values 4,611 (61) 9,783 (53) Forward Commitments Positive fair values — — 75,000 63 Negative fair values 414,110 (1,644) 180,000 (371) Interest Rate Swaps with Customers Positive fair values 3,777,684 375,567 2,903,489 143,484 Negative fair values 12,288 (2) 376,705 (695) Interest Rate Swaps with Dealer Counterparties Positive fair values 12,288 2 376,705 695 Negative fair values 3,777,684 (183,225) 2,903,489 (75,327) Foreign Exchange Contracts with Customers Positive fair values 2,947 32 3,373 38 Negative fair values 5,885 (280) 7,283 (154) Foreign Exchange Contracts with Correspondent Banks Positive fair values 7,325 340 9,028 192 Negative fair values 2,653 (19) 4,976 (45) The following table presents a summary of the fair value gains (losses) on derivative financial instruments: Consolidated Statements of Income Classification Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Mortgage banking derivatives (1) Mortgage banking income $ 1,783 $ 843 $ 9,527 $ 1,457 Interest rate swaps Other expense (12) 51 70 198 Foreign exchange contracts Other income 25 10 42 44 Net fair value gains on derivative financial instruments $ 1,796 $ 904 $ 9,639 $ 1,699 (1) Includes interest rate locks with customers and forward commitments. Fair Value Option The Corporation has elected to measure mortgage loans held for sale at fair value. The following table presents a summary of mortgage loans held for sale and the impact of the fair value election on the consolidated financial statements as of the periods shown: September 30, December 31, (in thousands) Amortized cost (1) $ 90,416 $ 37,396 Fair value 93,621 37,828 (1) Cost basis of mortgage loans held for sale represents the unpaid principal balance. Gains related to changes in fair values of mortgage loans held for sale were $658,000 and $2.8 million for the three and nine months ended September 30, 2020, respectively. During the three and nine months ended September 30, 2019, losses related to changes in fair values of mortgage loans held for sale were $499,000 and $174,000, respectively. Balance Sheet Offsetting Although certain financial assets and liabilities may be eligible for offset on the consolidated balance sheets because they are subject to master netting arrangements or similar agreements, the Corporation elects to not offset such qualifying assets and liabilities. The Corporation is a party to interest rate swaps with dealer counterparties and customers. Under these agreements, the Corporation has the right to net-settle multiple contracts with the same counterparty in the event of default on, or termination of, any one contract. Cash collateral is posted by the party with a net liability position in accordance with contract thresholds and can be used to settle the fair value of the interest rate swap agreements in the event of default. A daily settlement occurs through a clearing agent for changes in the fair value of centrally cleared derivatives. Not all of the derivatives are required to be cleared daily through a clearing agent. As a result, the total fair values of interest rate swap derivative assets and liabilities recognized on the consolidated balance sheet are not equal and offsetting. The Corporation is also a party to foreign currency exchange contracts with financial institution counterparties, under which the Corporation has the right to net-settle multiple contracts with the same counterparty in the event of default on, or termination of, any one contract. As with interest rate swaps, collateral is posted by the party with a net liability position in accordance with contract thresholds and can be used to settle the fair value of the foreign currency exchange contracts in the event of default. The Corporation also enters into agreements with customers in which it sells securities subject to an obligation to repurchase the same or similar securities, referred to as repurchase agreements. Under these agreements, the Corporation may transfer legal control over the assets but still maintain effective control through agreements that both entitle and obligate the Corporation to repurchase the assets. Therefore, repurchase agreements are reported as secured borrowings, classified in short-term borrowings on the consolidated balance sheets, while the securities underlying the repurchase agreements remain classified with investment securities on the consolidated balance sheets. The Corporation has no intent to set off these amounts, therefore, these repurchase agreements are not eligible for offset. The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) September 30, 2020 Interest rate swap derivative assets $ 375,569 $ (2) $ — $ 375,567 Foreign exchange derivative assets with correspondent banks 340 (19) — 321 Total $ 375,909 $ (21) $ — $ 375,888 Interest rate swap derivative liabilities $ 183,230 $ (2) $ (183,228) $ — Foreign exchange derivative liabilities with correspondent banks 19 (19) — — Total $ 183,249 $ (21) $ (183,228) $ — December 31, 2019 Interest rate swap derivative assets $ 144,179 $ (757) $ — $ 143,422 Foreign exchange derivative assets with correspondent banks 192 (45) — 147 Total $ 144,371 $ (802) $ — $ 143,569 Interest rate swap derivative liabilities $ 76,022 $ (757) $ (75,265) $ — Foreign exchange derivative liabilities with correspondent banks 45 (45) — — Total $ 76,067 $ (802) $ (75,265) $ — (1) For interest rate swap assets, amounts represent any derivative liability fair values that could be offset in the event of counterparty or customer default. For interest rate swap liabilities, amounts represent any derivative asset fair values that could be offset in the event of counterparty or customer default. (2) Amounts represent cash collateral received from the counterparty or posted by the Corporation on interest rate swap transactions and foreign exchange contracts with financial institution counterparties. Interest rate swaps with customers are collateralized by the same collateral securing the underlying loans to those borrowers. Cash and securities collateral amounts are included in the table only to the extent of the net derivative fair values.

Tax Credit Investments

Tax Credit Investments	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Tax Credit Investments	Tax Credit Investments TCIs are primarily for investments promoting qualified affordable housing projects and investments in community development entities. Investments in these projects generate a return primarily through the realization of federal income tax credits and deductions for operating losses over a specified time period. The TCIs are included in other assets, with any unfunded equity commitments recorded in other liabilities on the consolidated balance sheets. Certain TCIs qualify for the proportional amortization method and are amortized over the period the Corporation expects to receive the tax credits, with the expense included within income taxes on the consolidated statements of income. Other TCIs are accounted for under the equity method of accounting, with amortization included within non-interest expense on the consolidated statements of income. This amortization includes equity in partnership losses and the systematic write-down of investments over the period in which income tax credits are earned. All of the TCIs are evaluated for impairment at the end of each reporting period. The following table presents the balances of the Corporation's TCIs and related unfunded commitments: September 30, December 31, 2020 2019 Included in other assets: (in thousands) Affordable housing tax credit investment, net $ 145,415 $ 153,351 Other tax credit investments, net 70,379 64,354 Total TCIs, net $ 215,794 $ 217,705 Included in other liabilities: Unfunded affordable housing tax credit commitments $ 22,591 $ 16,684 Other tax credit liabilities 60,585 55,105 Total unfunded tax credit commitments and liabilities $ 83,176 $ 71,789 The following table presents other information relating to the Corporation's TCIs: Three Months Ended Nine Months Ended September 30 September 30 2020 2019 2020 2019 Components of income taxes: (in thousands) Affordable housing tax credits and other tax benefits $ (7,290) $ (7,852) $ (21,678) $ (23,002) Other tax credit investment credits and tax benefits (1,240) (1,136) (3,122) (3,407) Amortization of affordable housing investments, net of tax benefit 5,024 5,649 15,071 16,638 Deferred tax expense 275 238 691 715 Total net reduction in income tax expense $ (3,231) $ (3,101) $ (9,038) $ (9,056) Amortization of TCIs: Affordable housing tax credits investment $ 1,021 $ 863 $ 3,065 $ 2,508 Other tax credit investment amortization 673 670 1,529 2,008 Total amortization of TCIs $ 1,694 $ 1,533 $ 4,594 $ 4,516

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table presents changes in other comprehensive income: Before-Tax Amount Tax Effect Net of Tax Amount Three months ended September 30, 2020 (in thousands) Unrealized gain on securities $ 5,565 $ (1,232) $ 4,333 Reclassification adjustment for securities gains included in net income (1) (2) 1 (1) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 1,192 (264) 928 Amortization of net unrecognized pension and postretirement items (3) 329 (73) 255 Total Other Comprehensive Income $ 7,083 $ (1,568) $ 5,515 Three months ended September 30, 2019 Unrealized gain on securities (4) $ 23,150 $ (5,121) $ 18,029 Reclassification adjustment for securities gains included in net income (1) (4,492) 994 (3,498) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 4,405 (974) 3,430 Amortization of net unrecognized pension and postretirement items (3) 357 (80) 277 Total Other Comprehensive Income $ 23,419 $ (5,181) $ 18,238 Nine months ended September 30, 2020 Unrealized gain on securities $ 72,146 $ (15,960) $ 56,186 Reclassification adjustment for securities gains included in net income (1) (3,053) 676 (2,377) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 3,232 (715) 2,517 Amortization of net unrecognized pension and postretirement items (3) 984 (219) 765 Total Other Comprehensive Income $ 73,309 $ (16,218) $ 57,091 Nine months ended September 30, 2019 Unrealized gain on securities (4) $ 81,207 $ (17,963) $ 63,244 Reclassification adjustment for securities gains included in net income (1) (4,733) 1,047 (3,686) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 6,966 (1,541) 5,425 Non-credit related unrealized losses on other-than-temporarily impaired debt securities (875) 193 (682) Amortization of net unrecognized pension and postretirement items (3) 1,083 (240) 843 Total Other Comprehensive Income $ 83,648 $ (18,504) $ 65,144 (1) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Investment securities gains, net" on the Consolidated Statements of Income. See Note 3, "Investment Securities," for additional details. (2) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included as a reduction to "Interest Income" on the Consolidated Statements of Income. (3) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Salaries and employee benefits" on the Consolidated Statements of Income. See Note 12, "Employee Benefit Plans," for additional details. (4) Before-Tax amount includes a $3.7 million reclassification of unrealized loss related to the early adoption of ASU 2019-04. The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax: Unrealized Gains (Losses) on Investment Securities Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities Unrecognized Pension and Postretirement Plan Income (Costs) Total (in thousands) Three months ended September 30, 2020 Balance at June 30, 2020 $ 65,930 $ — $ (14,491) $ 51,439 Other comprehensive income before reclassifications 4,333 — — 4,333 Amounts reclassified from accumulated other comprehensive income (1) — 255 254 Amortization of net unrealized losses on AFS securities transferred to HTM 928 — — 928 Balance at September 30, 2020 $ 71,190 $ — $ (14,236) $ 56,954 Three months ended September 30, 2019 Balance at June 30, 2019 $ 2,368 $ (2) $ (14,523) $ (12,157) Other comprehensive income before reclassifications 18,029 — — 18,029 Amounts reclassified from accumulated other comprehensive income (loss) (3,498) — 277 (3,221) Amortization of net unrealized losses on AFS securities transferred to HTM 3,430 — — 3,430 Balance at September 30, 2019 $ 20,329 $ (2) $ (14,246) $ 6,081 Nine months ended September 30, 2020 Balance at December 31, 2019 $ 14,864 $ — $ (15,001) $ (137) Other comprehensive income before reclassifications 56,186 — — 56,186 Amounts reclassified from accumulated other comprehensive income (loss) (2,377) — 765 (1,612) Amortization of net unrealized losses on AFS securities transferred to HTM 2,517 — — 2,517 Balance at September 30, 2020 $ 71,190 $ — $ (14,236) $ 56,954 Nine months ended September 30, 2019 Balance at December 31, 2018 $ (44,654) $ 680 $ (15,089) $ (59,063) Other comprehensive income before reclassifications 63,244 (682) — 62,562 Amounts reclassified from accumulated other comprehensive income (loss) (3,686) — 843 (2,843) Amortization of net unrealized losses on AFS securities transferred to HTM 5,425 — — 5,425 Balance at September 30, 2019 $ 20,329 $ (2) $ (14,246) $ 6,081

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements FASB ASC Topic 820 establishes a fair value hierarchy for the inputs to valuation techniques used to measure assets and liabilities at fair value using the following three categories (from highest to lowest priority): • Level 1 – Inputs that represent quoted prices for identical instruments in active markets. • Level 2 – Inputs that represent quoted prices for similar instruments in active markets, or quoted prices for identical instruments in non-active markets. Also includes valuation techniques whose inputs are derived principally from observable market data other than quoted prices, such as interest rates or other market-corroborated means. • Level 3 – Inputs that are largely unobservable, as little or no market data exists for the instrument being valued. All assets and liabilities measured at fair value on both a recurring and nonrecurring basis, have been categorized into the above three levels. The following tables present assets and liabilities measured at fair value on a recurring basis and reported on the consolidated balance sheets: September 30, 2020 Level 1 Level 2 Level 3 Total (in thousands) Loans held for sale $ — $ 93,621 $ — $ 93,621 Available for sale investment securities: State and municipal securities — 926,554 — 926,554 Corporate debt securities — 342,558 — 342,558 Collateralized mortgage obligations — 532,473 — 532,473 Residential mortgage-backed securities — 321,695 — 321,695 Commercial mortgage-backed securities — 572,210 — 572,210 Auction rate securities — — 97,990 97,990 Total available for sale investment securities — 2,695,490 97,990 2,793,480 Other assets: Investments held in Rabbi Trust 21,828 — — 21,828 Derivative assets 372 387,563 — 387,935 Total assets $ 22,200 $ 3,176,674 $ 97,990 $ 3,296,864 Other liabilities: Deferred compensation liabilities $ 21,828 $ — $ — $ 21,828 Derivative liabilities 299 184,932 — 185,231 Total liabilities $ 22,127 $ 184,932 $ — $ 207,059 December 31, 2019 Level 1 Level 2 Level 3 Total (in thousands) Loans held for sale $ — $ 37,828 $ — $ 37,828 Available for sale investment securities: State and municipal securities — 652,927 — 652,927 Corporate debt securities — 374,957 2,400 377,357 Collateralized mortgage obligations — 693,718 — 693,718 Residential mortgage-backed securities — 177,312 — 177,312 Commercial mortgage-backed securities — 494,297 — 494,297 Auction rate securities — — 101,926 101,926 Total available for sale investment securities — 2,393,211 104,326 2,497,537 Other assets: Investments held in Rabbi Trust 22,213 — — 22,213 Derivative assets 230 145,365 — 145,595 Total assets $ 22,443 $ 2,576,404 $ 104,326 $ 2,703,173 Other liabilities: Deferred compensation liabilities $ 22,213 $ — $ — $ 22,213 Derivative liabilities 199 76,447 — 76,646 Total liabilities $ 22,412 $ 76,447 $ — $ 98,859 The valuation techniques used to measure fair value for the items in the preceding tables are as follows: Loans held for sale – This category includes mortgage loans held for sale that are measured at fair value. Fair values as of September 30, 2020 and December 31, 2019 were based on the price that secondary market investors were offering for loans with similar characteristics. See "Note 6 - Derivative Financial Instruments" for details related to the Corporation’s election to measure assets and liabilities at fair value. Available for sale investment securities – Included in this asset category are debt securities. Level 2 investment securities are valued by a third-party pricing service. The pricing service uses pricing models that vary based on asset class and incorporate available market information, including quoted prices of investment securities with similar characteristics. Because many fixed income securities do not trade on a daily basis, pricing models use available information, as applicable, through processes such as benchmark yield curves, benchmarking of like securities, sector groupings and matrix pricing. Standard market inputs include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data, including market research publications. For certain security types, additional inputs may be used, or some of the standard market inputs may not be applicable. • State and municipal securities/Collateralized mortgage obligations/Residential mortgage-backed securities/Commercial mortgage-backed securities – These debt securities are classified as Level 2. Fair values are determined by a third-party pricing service, as detailed above. • Corporate debt securities – This category consists of subordinated debt and senior debt issued by financial institutions ($338.2 million at September 30, 2020 and $362.3 million at December 31, 2019), single-issuer trust preferred securities issued by financial institutions ($0 at September 30, 2020 and $11.2 million at December 31, 2019) and other corporate debt issued by non-financial institutions ($4.4 million at September 30, 2020 and $3.9 million at December 31, 2019). As noted in "Note 3 - Investment Securities", several corporate debt securities were sold in the second quarter of 2020. Refer to the specific note for further information. Level 2 investment securities include the Corporation’s holdings of subordinated debt and senior debt, other corporate debt issued by non-financial institutions and $0 and $8.8 million of single-issuer TruPS held at September 30, 2020 and December 31, 2019, respectively. The fair values for these corporate debt securities are determined by a third-party pricing service, as detailed above. Level 3 investment securities include the Corporation’s investments in certain single-issuer TruPS ($0 at September 30, 2020 and $2.4 million at December 31, 2019). The fair values of these securities were determined based on quotes provided by third-party brokers who determined fair values based predominantly on internal valuation models which were not indicative prices or binding offers. The Corporation’s third-party pricing service cannot derive fair values for these securities primarily due to inactive markets for similar investments. Level 3 values are tested by management primarily through trend analysis, by comparing current values to those reported at the end of the preceding calendar quarter, and determining if they are reasonable based on price and spread movements for this asset class. • Auction rate securities – Due to their illiquidity, ARCs are classified as Level 3 investment securities and are valued through the use of an expected cash flows model prepared by a third-party valuation expert. The assumptions used in preparing the expected cash flows model include estimates for coupon rates, time to maturity and market rates of return. The most significant unobservable input to the expected cash flows model is an assumed return to market liquidity sometime in the next five years. If the assumed return to market liquidity was lengthened beyond the next five years, this would result in a decrease in the fair value of these ARCs. The Corporation believes that the trusts underlying the ARCs will self-liquidate as student loans are repaid. Level 3 fair values are tested by management through the performance of a trend analysis of the market price and discount rate. Changes in the price and discount rates are compared to changes in market data, including bond ratings, parity ratios, balances and delinquency levels. Investments held in Rabbi Trust – This category consists of mutual funds that are held in trust for employee deferred compensation plans that the Corporation has elected to measure at fair value. Shares of mutual funds are valued based on net asset value, which represent quoted market prices for the underlying shares held in the mutual funds, and as such, are classified as Level 1. Derivative assets – Fair value of foreign currency exchange contracts classified as Level 1 assets ($372,000 at September 30, 2020 and $230,000 at December 31, 2019). The mutual funds and foreign exchange prices used to measure these items at fair value are based on quoted prices for identical instruments in active markets. Level 2 assets, representing the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors ($12.0 million at September 30, 2020 and $1.2 million at December 31, 2019) and the fair value of interest rate swaps ($375.6 million at September 30, 2020 and $144.2 million at December 31, 2019). The fair values of the Corporation’s interest rate locks, forward commitments and interest rate swaps represent the amounts that would be required to settle the derivative financial instruments at the balance sheet date. See "Note 6 - Derivative Financial Instruments," for additional information. Deferred compensation liabilities – Fair value of amounts due to employees under deferred compensation plans, classified as Level 1 liabilities and are included in other liabilities on the consolidated balance sheets. The fair values of these liabilities are determined in the same manner as the related assets, as described under the heading "Investments held in Rabbi Trust" above. Derivative liabilities – Level 1 liabilities, representing the fair value of foreign currency exchange contracts ($299,000 at September 30, 2020 and $199,000 at December 31, 2019). Level 2 liabilities, representing the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors ($1.7 million at September 30, 2020 and $424,000 at December 31, 2019) and the fair value of interest rate swaps ($183.2 million at September 30, 2020 and $76.0 million at December 31, 2019). The fair values of these liabilities are determined in the same manner as the related assets, as described under the heading "Derivative assets" above. The following table presents the changes in the Corporation’s available for sale investment securities measured at fair value on a recurring basis using unobservable inputs (Level 3): Pooled Trust Single-issuer ARCs Three months ended September 30, 2020 (in thousands) Balance at June 30, 2020 $ — $ — $ 100,859 Sales — — — Unrealized adjustment to fair value (1) — — (2,869) Balance at September 30, 2020 $ — $ — $ 97,990 Three months ended September 30, 2019 Balance at June 30, 2019 $ — $ 2,370 $ 103,365 Unrealized adjustment to fair value (1) — (2) (67) Discount accretion — 2 — Balance at September 30, 2019 $ — $ 2,370 $ 103,298 Nine months ended September 30, 2020 Balance at December 31, 2019 $ — $ 2,400 $ 101,926 Sales — (2,160) — Unrealized adjustment to fair value (1) — (242) (3,936) Discount accretion — 2 — Balance at September 30, 2020 $ — $ — $ 97,990 Nine months ended September 30, 2019 Balance at December 31, 2018 $ 875 $ 2,400 $ 102,994 Sales (770) — — Unrealized adjustment to fair value (1) (105) (32) 304 Discount accretion — 2 — Balance at September 30, 2019 $ — $ 2,370 $ 103,298 (1) Pooled trust preferred securities, single-issuer trust preferred securities and ARCs are classified as available for sale investment securities; as such, the unrealized adjustment to fair value was recorded as an unrealized holding gain (loss) and included as a component of "available for sale at estimated fair value" on the consolidated balance sheets. Certain assets are not measured at fair value on an ongoing basis, but are subject to fair value measurement in certain circumstances, such as upon their acquisition or when there is evidence of impairment. The following table presents Level 3 financial assets measured at fair value on a nonrecurring basis: September 30, 2020 December 31, 2019 (in thousands) Net Loans $ 113,073 $ 144,807 OREO 4,565 6,831 MSRs (1) 29,682 45,193 Total assets $ 147,320 $ 196,831 (1) Amounts shown are estimated fair value. MSRs are recorded on the Corporation's consolidated balance sheets at lower of amortized cost or fair value. See "Note 5 - Mortgage Servicing Rights" for additional information. The valuation techniques used to measure fair value for the items in the table above are as follows: • Net Loans – This category consists of loans that were individually evaluated for impairment and have been classified as Level 3 assets. In 2020, the amount shown is the balance of nonaccrual loans, net of the related ACL. In 2019, the amount shown is the balance of impaired loans, net of the related ACL. See "Note 4 - Allowance for Credit Losses and Asset Quality," for additional details. • OREO – This category consists of OREO classified as Level 3 assets, for which the fair values were based on estimated selling prices less estimated selling costs for similar assets in active markets. • MSRs - This category consists of MSRs, which were initially recorded at fair value upon the sale of residential mortgage loans to secondary market investors, and subsequently carried at the lower of amortized cost or fair value. MSRs are amortized as a reduction to servicing income over the estimated lives of the underlying loans. MSRs are stratified by product type and evaluated for impairment by comparing each stratum's carrying amount to its estimated fair value. Fair values are determined at the end of each quarter through a discounted cash flows valuation performed by a third-party valuation expert. Significant inputs to the valuation included expected net servicing income, the discount rate and the expected life of the underlying loans. Expected life is based on the contractual terms of the loans, as adjusted for prepayment projections. The weighted average annual constant prepayment rate and the weighted average discount rate used in the September 30, 2020 valuation were 17.7% and 9.5%, respectively. Management reviews the reasonableness of the significant inputs to the third-party valuation in comparison to market data. See "Note 5 - Mortgage Servicing Rights," for additional information. In 2008, the Corporation received Class B restricted shares of Visa, Inc. ("Visa") as part of Visa’s initial public offering. These securities are considered equity securities without readily determinable fair values. As such, the approximately 133,000 Visa Class B shares owned as of September 30, 2020 were carried at a zero cost basis. The following tables present the carrying amounts and estimated fair values of the Corporation’s financial instruments as of the periods shown. A general description of the methods and assumptions used to estimate such fair values follows: September 30, 2020 Estimated Fair Value Carrying Amount Level 1 Level 2 Level 3 Total (in thousands) FINANCIAL ASSETS Cash and cash equivalents $ 1,534,890 $ 1,534,890 $ — $ — $ 1,534,890 FRB and FHLB stock 93,964 — 93,964 — 93,964 Loans held for sale 93,621 — 93,621 — 93,621 AFS securities 2,793,480 — 2,695,490 97,990 2,793,480 HTM securities 304,241 — 324,940 — 324,940 Net Loans 18,761,796 — — 18,514,547 18,514,547 Accrued interest receivable 70,766 70,766 — — 70,766 Other assets 694,442 272,632 387,563 34,247 694,442 FINANCIAL LIABILITIES Demand and savings deposits $ 17,997,443 $ 17,997,443 $ — $ — $ 17,997,443 Brokered deposits 317,588 275,719 41,869 — 317,588 Time deposits 2,415,020 — 2,442,422 — 2,442,422 Short-term borrowings 611,727 611,727 — — 611,727 Accrued interest payable 9,123 9,123 — — 9,123 FHLB advances and long-term debt 1,296,012 — 1,342,192 — 1,342,192 Other liabilities 352,740 152,272 184,935 15,533 352,740 December 31, 2019 Estimated Fair Value Carrying Amount Level 1 Level 2 Level 3 Total (in thousands) FINANCIAL ASSETS Cash and cash equivalents $ 517,791 $ 517,791 $ — $ — $ 517,791 FRB and FHLB stock 97,422 — 97,422 — 97,422 Loans held for sale 37,828 — 37,828 — 37,828 AFS securities 2,497,537 — 2,393,211 104,326 2,497,537 HTM securities 369,841 — 383,705 — 383,705 Net Loans 16,673,904 — — 16,485,122 16,485,122 Accrued interest receivable 60,898 60,898 — — 60,898 Other assets 431,565 234,176 145,365 52,024 431,565 FINANCIAL LIABILITIES Demand and savings deposits $ 14,327,453 $ 14,327,453 $ — $ — $ 14,327,453 Brokered deposits 264,531 223,982 40,549 — 264,531 Time deposits 2,801,930 — 2,828,988 — 2,828,988 Short-term borrowings 883,241 883,241 — — 883,241 Accrued interest payable 8,834 8,834 — — 8,834 FHLB advances and long-term debt 881,769 — 878,385 — 878,385 Other liabilities 221,542 142,508 76,447 2,587 221,542 Fair values of financial instruments are significantly affected by the assumptions used, principally the timing of future cash flows and discount rates. Because assumptions are inherently subjective in nature, the estimated fair values cannot be substantiated by comparison to independent market quotes and, in many cases, the estimated fair values could not necessarily be realized in an immediate sale or settlement of the instrument. The aggregate fair value amounts presented do not necessarily represent management’s estimate of the underlying value of the Corporation. For short-term financial instruments, defined as those with remaining maturities of 90 days or less, and excluding those recorded at fair value on the Corporation’s consolidated balance sheets, book value was considered to be a reasonable estimate of fair value. The following instruments are predominantly short-term: Assets Liabilities Cash and cash equivalents Demand and savings deposits Accrued interest receivable Short-term borrowings Accrued interest payable FRB and FHLB stock represent restricted investments and are carried at cost. As of September 30, 2020, fair values for loans and time deposits were estimated by discounting future cash flows using the current rates, as adjusted for liquidity considerations, at which similar loans would be made to borrowers and similar deposits would be issued to customers for the same remaining maturities. Fair values of loans also include estimated credit losses that would be assumed in a market transaction, which represents estimated exit prices. Brokered deposits consists of demand and saving deposits, which are classified as Level 1, and time deposits, which are classified as Level 2. The fair value of these deposits are determined in a manner consistent with the respective type of deposits discussed above.

Net Income Per Share

Net Income Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share Basic net income per share is calculated as net income divided by the weighted average number of shares outstanding. Diluted net income per share is calculated as net income divided by the weighted average number of shares outstanding plus the incremental number of shares added as a result of converting common stock equivalents, calculated using the treasury stock method. The Corporation’s common stock equivalents consist of outstanding stock options, RSUs, and PSUs. PSUs are required to be included in weighted average shares outstanding if performance measures, as defined in each PSU award agreement, are met as of the end of the period. A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows (in thousands, except per share data): Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 Weighted average shares outstanding (basic) 162,061 165,324 162,416 167,834 Impact of common stock equivalents 518 802 667 888 Weighted average shares outstanding (diluted) 162,579 166,126 163,083 168,722 Per share: Basic $ 0.38 $ 0.38 $ 0.78 $ 1.06 Diluted 0.38 0.37 0.78 1.06

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based CompensationThe Corporation grants equity awards to employees in the form of stock options, restricted stock, RSUs or PSUs under its Amended and Restated Equity and Cash Incentive Compensation Plan ("Employee Equity Plan"). Recent grants of equity awards under the Employee Equity Plan have generally been limited to RSUs and PSUs. In addition, employees may purchase stock under the Corporation’s Employee Stock Purchase Plan. The fair value of equity awards granted to employees is recognized as compensation expense over the period during which employees are required to provide service in exchange for such awards. Compensation expense for PSUs is also recognized over the period during which employees are required to provide service in exchange for such awards, however, compensation expense may vary based on the expectations for actual performance relative to defined performance measures. The Corporation also grants equity awards to non-employee members of its board of directors and subsidiary bank boards of directors under the 2011 Directors’ Equity Participation Plan, which was amended and approved by shareholders as the Amended and Restated Directors’ Equity Participation Plan in 2019 ("Directors’ Plan"). Under the Directors’ Plan, the Corporation can grant equity awards to non-employee holding company and subsidiary bank directors in the form of stock options, restricted stock, RSUs or common stock. Recent grants of equity awards under the Directors’ Plan have been limited to RSUs. Equity awards under the Employee Equity Plan are generally granted annually and become fully vested over or after a three-year vesting period. The vesting period for non-performance-based awards represents the period during which employees are required to provide service in exchange for such awards. Equity awards under the Directors' Plan are generally granted annually and become fully vested after a one-year vesting period. Certain events, as defined in the Employee Equity Plan and the Directors' Plan, result in the acceleration of the vesting of equity awards. Fair values for RSUs and a majority of PSUs are based on the trading price of the Corporation’s stock on the date of grant and earn dividend equivalents during the vesting period, which are forfeitable if the awards do not vest. The fair value of certain PSUs are estimated through the use of the Monte Carlo valuation methodology as of the date of grant. As of September 30, 2020, the Employee Equity Plan had 9.3 million shares reserved for future grants through 2023, and the Directors’ Plan had approximately 180,000 shares reserved for future grants through 2029. The following table presents compensation expense and the related tax benefits for equity awards recognized in the consolidated statements of income: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Compensation expense $ 1,875 $ 2,110 $ 5,403 $ 5,458 Tax benefit (397) (451) (1,144) (1,194) Stock-based compensation expense, net of tax benefit $ 1,478 $ 1,659 $ 4,259 $ 4,264

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Interest cost $ 681 $ 813 $ 2,043 $ 2,443 Expected return on plan assets (982) (688) (2,946) (2,066) Net amortization and deferral 465 496 1,395 1,486 Net periodic pension cost $ 164 $ 621 $ 492 $ 1,863 The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Interest cost $ 11 $ 15 $ 33 $ 45 Net accretion and deferral (137) (139) (411) (417) Net periodic benefit $ (126) $ (124) $ (378) $ (372)

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments The Corporation is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. Those financial instruments include commitments to extend credit and letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized on the Corporation’s consolidated balance sheets. Exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and letters of credit is represented by the outstanding amount of those instruments. The outstanding amounts of commitments to extend credit and letters of credit were as follows: September 30, December 31, 2019 (in thousands) Commitments to extend credit $ 8,325,169 $ 6,689,519 Standby letters of credit 294,429 303,020 Commercial letters of credit 54,112 50,432 The Corporation records a reserve for unfunded lending commitments, included in ACL - OBS credit exposures, which represents management’s estimate of credit losses associated with unused commitments to extend credit and letters of credit. See "Note 4 - Allowance for Credit Losses and Asset Quality," for additional details. Residential Lending The Corporation originates and sells residential mortgages to secondary market investors. The Corporation provides customary representations and warranties to secondary market investors that specify, among other things, that the loans have been underwritten to the standards of the secondary market investor. The Corporation may be required to repurchase specific loans, or reimburse the investor for a credit loss incurred on a sold loan if it is determined that the representations and warranties have not been met. Under some agreements with secondary market investors, the Corporation may have additional credit exposure beyond customary representations and warranties, based on the specific terms of those agreements. The Corporation maintains a reserve for estimated losses related to loans sold to investors. As of September 30, 2020 and December 31, 2019, the total reserve for losses on residential mortgage loans sold was $1.1 million and $3.2 million, respectively, including reserves for both representation and warranty and credit loss exposures. With the adoption of CECL on January 1, 2020 the reserve for estimated losses on certain residential mortgage loans sold to investors was reclassified to ACL - OBS credit exposures. This reclassification resulted in a $2.1 million increase to ACL - OBS credit exposures and a corresponding decrease to the reserve for estimated losses related to loans sold to investors in the first quarter of 2020. Legal Proceedings The Corporation is involved in various pending and threatened claims and other legal proceedings in the ordinary course of its business activities. The Corporation evaluates the possible impact of these matters, taking into consideration the most recent information available. A loss reserve is established for those matters for which the Corporation believes a loss is both probable and reasonably estimable. Once established, the reserve is adjusted as appropriate to reflect any subsequent developments. Actual losses with respect to any such matter may be more or less than the amount estimated by the Corporation. For matters where a loss is not probable, or the amount of the loss cannot be reasonably estimated by the Corporation, no loss reserve is established. In addition, from time to time, the Corporation is involved in investigations or other forms of regulatory or governmental inquiry covering a range of possible issues and, in some cases, these may be part of similar reviews of the specified activities of other companies. These inquiries or investigations could lead to administrative, civil or criminal proceedings involving the Corporation, and could result in fines, penalties, restitution, other types of sanctions, or the need for the Corporation to undertake remedial actions, or to alter its business, financial or accounting practices. The Corporation’s practice is to cooperate fully with regulatory and governmental inquiries and investigations. As of the date of this report, the Corporation believes that any liabilities, individually or in the aggregate, which may result from the final outcomes of pending legal proceedings, or regulatory or governmental inquiries or investigations, will not have a material adverse effect on the financial condition of the Corporation. However, legal proceedings, inquiries and investigations are often unpredictable, and it is possible that the ultimate resolution of any such matters, if unfavorable, may be material to the Corporation’s results of operations in any future period, depending, in part, upon the size of the loss or liability imposed and the operating results for the period, and could have a material adverse effect on the Corporation’s business. In addition, regardless of the ultimate outcome of any such legal proceeding, inquiry or investigation, any such matter could cause the Corporation to incur additional expenses, which could be significant, and possibly material, to the Corporation’s results of operations in any future period. SEC Investigation As disclosed in the Corporation’s Current Report on Form 8-K filed with the SEC on September 28, 2020, on September 28, 2020, the SEC announced that it has accepted an Offer of Settlement submitted by the Corporation to resolve the previously disclosed investigation by the staff of the Division of Enforcement of the SEC regarding certain accounting determinations that could have impacted the Corporation’s reported earnings per share. Under the settlement, without admitting or denying the SEC’s findings in this matter, the Corporation consented to the entry of an administrative civil cease-and-desist order by the SEC with respect to certain violations of the federal securities laws in the fourth quarter of 2016 through the second quarter of 2017, and the payment of a civil monetary penalty of $1.5 million. Kress v. Fulton Bank, N.A. On October 15, 2019, a former Fulton Bank teller supervisor, D. Kress filed a putative collective and class action lawsuit on behalf of herself and other teller supervisors, tellers, and other similar non-exempt employees in the U.S. District Court for the District of New Jersey, D. Kress v. Fulton Bank, N.A. , Case No. 1:19-cv-18985. Fulton Bank accepted summons without a formal service of process on January 20, 2020. The lawsuit alleges that Fulton Bank did not record or otherwise account for the amount of time D. Kress and putative collective and class members spent conducting branch opening security procedures. The allegation is that, as a result, Fulton Bank did not properly compensate those employees for their regular and overtime wages. The lawsuit alleges that by doing so, Fulton violated: (i) the federal Fair Labor Standards Act and seeks back overtime wages for a period of three years, liquidated damages and attorney fees and costs; (ii) the New Jersey State Wage and Hour Law and seeks back overtime wages for a period of six years, treble damages and attorney fees and costs; and (iii) the New Jersey Wage Payment Law and seeks back wages for a period of six years, treble damages and attorney fees and costs. The lawsuit also asserts New Jersey common law claims seeking compensatory damages and interest. Following the submission of a formal demand for damages by Counsel representing plaintiffs ("Plaintiffs’ Counsel"), the Corporation and Plaintiffs’ Counsel engaged in negotiations regarding the potential settlement of this lawsuit on a collective and class basis. While the negotiations are ongoing, the Corporation and Plaintiffs’ Counsel have reached a tentative agreement with respect to the financial terms of a potential settlement to resolve this lawsuit. If the parties are able to reach a formal settlement agreement, that settlement agreement would be subject to approval by the U.S. District Court for the District of New Jersey. The Corporation is not able to provide any assurance that a formal settlement agreement will be reached, or that the District Court will approve the settlement agreement. The financial terms of the potential settlement involve an amount that is not expected to be material to the Corporation. The Corporation established an accrued liability during the third quarter of 2020 for the amount of the potential settlement.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term DebtIn March 2020, the Corporation issued $200.0 million and $175.0 million of subordinated notes due in 2030 and 2035, respectively. The subordinated notes maturing in 2030 were issued with a fixed-to-floating rate of 3.25% and an effective rate of 3.35%, due to issuance costs, and the subordinated notes maturing in 2035 were issued with a fixed-to-floating rate of 3.75% and an effective rate of 3.85%, due to issuance costs.

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventOn October 29, 2020 the Corporation issued 8,000,000 depositary shares ("Depositary Shares"), each representing a 1/40th interest in a share of Fulton’s 5.125% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A, with a liquidation preference of $1,000 per share (equivalent to $25.00 per Depositary Share), for an aggregate offering amount of $200 million. The Corporation received net proceeds from the offering of $193.7 million, after deducting underwriting discounts and commissions and before deducting transaction expenses payable by the Corporation.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying unaudited Consolidated Financial Statements of the Corporation have been prepared in conformity with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as revenues and expenses during the period. Actual results could differ from those estimates. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the notes thereto included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2019. Operating results for the three and nine months ended September 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. The Corporation evaluates subsequent events through the date of filing of this Form 10-Q with the SEC.
Recently Issued Accounting Standards	CECL Adoption and Updated Significant Accounting Policy On January 1, 2020, the Corporation adopted ASU 2016-13, Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments, which replaces the incurred loss methodology, and is referred to as CECL. The measurement of expected credit losses under CECL is applicable to financial assets measured at amortized cost, including loans and HTM debt securities. It also applies to OBS credit exposures, such as loan commitments, standby letters of credit, financial guarantees, and other similar instruments, and net investments in leases recognized by a lessor in accordance with ASC Topic 842. The Corporation adopted CECL using the modified retrospective method for all financial assets measured at amortized cost, net of investments in leases and OBS credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under CECL, while prior period results are reported in accordance with the previously applicable incurred loss methodology. The Corporation recorded an increase of $58.3 million to the ACL on January 1, 2020 as a result of the adoption of CECL. Retained earnings decreased $43.8 million and deferred tax assets increased by $12.4 million. Included in the $58.3 million increase to the ACL was $2.1 million for certain OBS credit exposures that was previously recognized in other liabilities before the adoption of CECL. Loans : Loans are stated at their principal amount outstanding, except for mortgage loans held for sale, which are carried at fair value. Interest income on loans is accrued as earned. Unearned income on lease financing receivables is recognized on a basis which approximates the effective yield method. In general, loans are placed on non-accrual status once they become 90 days delinquent as to principal or interest. In certain cases a loan may be placed on non-accrual status prior to being 90 days delinquent if there is an indication that the borrower is having difficulty making payments, or the Corporation believes it is probable that all amounts will not be collected according to the contractual terms of the loan agreement. When interest accruals are discontinued, unpaid interest previously credited to income is reversed. Non-accrual loans may be restored to accrual status when all delinquent principal and interest has been paid currently for six consecutive months or the loan is considered secured and in the process of collection. The Corporation generally applies payments received on non-accruing loans to principal until such time as the principal is paid off, after which time any payments received are recognized as interest income. If the Corporation believes that all amounts outstanding on a non-accrual loan will ultimately be collected, payments received subsequent to its classification as a non-accrual loan are allocated between interest income and principal. A loan that is 90 days delinquent may continue to accrue interest if the loan is both adequately secured and is in the process of collection. Past due status is determined based on contractual due dates for loan payments. An adequately secured loan is one that has collateral with a supported fair value that is sufficient to discharge the debt, and/or has an enforceable guarantee from a financially responsible party. A loan is considered to be in the process of collection if collection is proceeding through legal action or through other activities that are reasonably expected to result in repayment of the debt or restoration to current status in the near future. Loans deemed to be a loss are written off through a charge against the ACL. Closed-end consumer loans are generally charged off when they become 120 days past due (180 days for open-end consumer loans) if they are not adequately secured by real estate. All other loans are evaluated for possible charge-off when it is probable that the balance will not be collected, based on the ability of the borrower to pay and the value of the underlying collateral, if any. Principal recoveries of loans previously charged off are recorded as increases to the ACL. Loan Origination Fees and Costs: Loan origination fees and the related direct origination costs are deferred and amortized over the life of the loan as an adjustment to interest income using the effective yield method. For mortgage loans sold, net loan origination fees and costs are included in the gain or loss on sale of the related loan, as components of mortgage banking. Loan origination fees and the related direct origination costs for loans originated under the PPP loan program are amortized on a straight-line basis over the repayment period of the loan. To the extent that a PPP loan is forgiven, the unamortized fees and costs will be recorded at the time of forgiveness. Troubled Debt Restructurings: Loans are accounted for and reported as TDRs when, for economic or legal reasons, the Corporation grants a concession to a borrower experiencing financial difficulty that it would not otherwise consider. Concessions, whether negotiated or imposed by bankruptcy, granted under a TDR typically involve a temporary deferral of scheduled loan payments, an extension of a loan’s stated maturity date or a reduction in the interest rate. Non-accrual TDRs can be restored to accrual status if principal and interest payments, under the modified terms, are current for six consecutive months after modification. On March 27, 2020 the CARES Act was signed into law. The CARES Act includes an option for financial institutions to suspend the requirements of GAAP for certain loan modifications that would otherwise be categorized as a TDR. Certain conditions must be met with respect to the loan modification including that the modification is related to COVID-19, the modified loan was not more than 30 days past due on December 31, 2019 and the modification was executed between March 1, 2020 and the earlier of (a) 60 days after the date of the COVID-19 national emergency comes to an end or (b) December 31, 2020. The Corporation is applying the option under the CARES act for all loan modifications that qualify. On April 7, 2020, Troubled Debt Restructurings: Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by COVID-19 was issued by the federal banking regulatory agencies. Included in the Interagency Statement were provisions permitting banks that grant loan modifications to customers impacted by COVID-19 to exclude those modifications from loans categorized as TDRs. The Corporation is adopting the guidance in this Interagency Statement effective for COVID-19-related modifications occurring subsequent to March 13, 2020. Allowance for Credit Losses: The discussion that follows describes the methodology for determining the ACL under the CECL model that was adopted January 1, 2020. The allowance methodology for prior periods is disclosed in the Corporation’s 2019 Annual Report on Form 10-K. The Corporation has elected to exclude accrued interest receivable from the measurement of its ACL. When a loan is placed on non-accrual status, any outstanding accrued interest is reversed against interest income. Loans: The ACL for loans is an estimate of the expected losses to be realized over the life of the loans in the portfolio. The ACL is determined for two distinct categories of loans: 1) loans evaluated collectively for expected credit losses and 2) loans evaluated individually for expected credit losses. Loans Evaluated Collectively : Loans evaluated collectively for expected credit losses include loans on accrual status, excluding accruing TDRs, and loans initially evaluated individually, but determined not to have enhanced credit risk characteristics. This category includes loans on non-accrual status and TDRs where the total commitment amount is less than $1 million. The ACL is estimated by applying a probability of default (PD) and loss given default (LGD) to the exposure at default (EAD) at the loan or lease level. In order to determine the PD, LGD, and EAD inputs: • Loans are aggregated into pools based on similar risk characteristics. • The PD and LGD model components are determined based on loss estimates driven by historical credit loss experience for each pool of loans. • The PD model components use econometric regression models that use the Corporation’s historical credit loss experience and economic variable inputs to estimate a PD for each loan pool. The LGD model component calculates a lifetime LGD estimate across each pool of loans utilizing a loss rate approach based on the Corporation’s historical charge-off and the balance at the time of loan default adjusted for the Corporation’s recovery experience. • Reasonable and supportable economic variable forecasts are incorporated into the PD model components. • Reasonable and supportable forecast periods are based on different economic forecasts and scenarios sourced from an external third party. A future loss forecast over the reasonable and supportable forecast period is based on the projected performance of specific economic variables that statistically correlate loss experience in the various loan pools. • After the reasonable and supportable forecast period, economic variable forecasts naturally revert, at the input level,to a long-run average. • To calculate the EAD model component, cash flow assumptions are established for each loan using maturity date, amortization schedule and interest rate. In addition, a constant prepayment rate is calculated for each loan pool. Loans Evaluated Individually : Loans evaluated individually for expected credit losses include loans on non-accrual status and TDRs where the commitment amount equals or exceeds $1.0 million. The required ACL for such loans is determined using either the present value of expected future cash flows, observable market price or the fair value of collateral. Loans evaluated individually may have specific allocations assigned if the measured value of the loan using one of the noted techniques is less than its current carrying value. For loans measured using the fair value of collateral, if the analysis determines that sufficient collateral value would be available for repayment of the debt, then no allocations would be assigned to those loans. Collateral could be in the form of real estate or business assets, such as accounts receivable or inventory, in the case of commercial and industrial loans. Commercial and industrial loans may also be secured by real estate. For loans secured by real estate, estimated fair values are determined primarily through appraisals performed by third-party appraisers, discounted to arrive at expected net sale proceeds. For collateral dependent loans, estimated real estate fair values are also net of estimated selling costs. When a real estate secured loan is impaired, a decision is made regarding whether an updated appraisal of the real estate is necessary. This decision is based on various considerations, including: the age of the most recent appraisal; the loan-to-value ratio based on the original appraisal; the condition of the property; the Corporation’s experience and knowledge of the real estate market; the purpose of the loan; market factors; payment status; the strength of any guarantors; and the existence and age of other indications of value such as broker price opinions, among others. The Corporation generally obtains updated appraisals performed by third-party appraisers for impaired loans secured predominantly by real estate every 12 months. When updated appraisals are not obtained for loans secured by real estate, fair values are estimated based on the original appraisal values, as long as the original appraisal indicated an acceptable loan-to-value position and there has not been a significant deterioration in the collateral value since the original appraisal was performed. For loans with principal balances greater than or equal to $1.0 million secured by non-real estate collateral, such as accounts receivable or inventory, estimated fair values are determined based on borrower financial statements, inventory listings, accounts receivable agings or borrowing base certificates. Indications of value from these sources are generally discounted based on the age of the financial information or the quality of the assets. Liquidation or collection discounts are applied to these assets based upon existing loan evaluation policies. Management regularly reviews loans in the portfolio to assess credit quality indicators and to determine appropriate loan classification. For commercial loans, commercial mortgages and construction loans to commercial borrowers, an internal risk rating process is used. The Corporation believes that internal risk ratings are the most relevant credit quality indicator for these types of loans. The migration of loans through the various internal risk rating categories is a significant component of the ACL methodology for these loans, which bases the PD on this migration. Assigning risk ratings involves judgment. Risk ratings may be changed based on ongoing monitoring procedures, or if specific loan review assessments identify a deterioration or an improvement in the loan. The following is a summary of the Corporation's internal risk rating categories: • Pass : These loans do not currently pose undue credit risk and can range from the highest to average quality, depending on the degree of potential risk. • Special Mention : These loans have a heightened credit risk, but not to the point of justifying a classification of Substandard. Loans in this category are currently acceptable, but are nevertheless potentially weak. • Substandard or Lower : These loans are inadequately protected by current sound worth and paying capacity of the borrower. There exists a well-defined weakness or weaknesses that jeopardize the normal repayment of the debt. The allocation of the ACL is reviewed to evaluate its appropriateness in relation to the overall risk profile of the loan portfolio. The Corporation considers risk factors such as: local and national economic conditions; trends in delinquencies and non-accrual loans; the diversity of borrower industry types; and the composition of the portfolio by loan type. Qualitative and Other Adjustments to ACL: In addition to the quantitative credit loss estimates for loans evaluated collectively, qualitative factors that may not be fully captured in the quantitative results are also evaluated. These qualitative factors include changes in lending policy, the nature and volume of the portfolio, overall business conditions in the economy, credit concentrations, specific industry risks, competition, model imprecision and legal and regulatory requirements. Qualitative adjustments are judgmental and are based on management’s knowledge of the portfolio and the markets in which the Corporation operates. Qualitative adjustments are evaluated and approved on a quarterly basis. Additionally, the ACL includes other allowance categories that are not directly incorporated in the quantitative results. These categories include but are not limited to loans-in-process, trade acceptances and overdrafts. OBS Credit Exposures: The ACL for OBS credit exposures is recorded in other liabilities on the consolidated balance sheets. This portion of the ACL represents management’s estimate of expected losses in its unfunded loan commitments and other OBS credit exposures. The ACL specific to unfunded commitments is determined by estimating future draws and applying the expected loss rates on those draws. Future draws are based on historical averages of utilization rates (i.e., the likelihood of draws taken). The ACL for OBS credit exposures is increased or decreased by charges or reductions to expense, through the provision for credit losses. HTM Debt Securities: Expected credit losses on HTM debt securities would be recorded in the ACL on HTM debt securities. As of September 30, 2020, no HTM debt securities required an ACL as these investments consist solely of government guaranteed residential mortgage-backed securities. AFS Debt Securities : The ACL approach for AFS debt securities differs from the CECL approach used for HTM debt securities as AFS debt securities are carried at fair value rather than amortized cost. Prior to the adoption of CECL, credit losses on AFS debt securities were determined using an OTTI approach. Under CECL, the concept of OTTI has been eliminated, but the general approach to determining credit losses is largely consistent with the OTTI method. Under CECL, credit losses on AFS debt securities are recognized through an ACL rather than through a direct write-down of the security. As of September 30, 2020, no AFS debt securities required an ACL. Other Recently Adopted Accounting Standards On January 1, 2020, the Corporation adopted ASC Update 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This update changes the fair value measurement disclosure requirements of ASC Topic 820 "Fair Value Measurement." Among other things, the update modifies the disclosure objective paragraphs of ASC 820 to eliminate: (1) "at a minimum" from the phrase "an entity shall disclose at a minimum;" and (2) other similar disclosure requirements to promote the appropriate exercise of discretion by entities. The Corporation adopted this standards update effective with its March 31, 2020 quarterly report on Form 10-Q and it did not have a material impact on its consolidated financial statements. On January 1, 2020, the Corporation adopted ASC Update 2018-15 - Intangibles - Goodwill and Other - Internal-Use Software (Topic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This update requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in ASC Subtopic 350-40 to determine which implementation costs to capitalize as assets. The Corporation adopted this standards update effective with its March 31, 2020 quarterly report on Form 10-Q and it did not have a material impact on its consolidated financial statements In March 2020, the Corporation adopted ASC Update 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This standards update provided optional guidance for a limited time to ease the potential burden in accounting for reference rate reform, specific to those using LIBOR or another reference rate expected to be discontinued due to this reform. The Corporation adopted this standards update effective with its March 31, 2020 quarterly report on Form 10-Q and it did not have a material impact on its consolidated financial statements. Recently Issued Accounting Standards Standard Description Date of Anticipated Adoption Effect on Financial Statements ASC Update 2018-14 Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans This update amends ASC Topic 715-20 to add, remove, and clarify disclosure requirements related to defined benefit pension and other postretirement plans. Fiscal Year 2020 The Corporation intends to adopt this standards update effective with its December 31, 2020 annual report on Form 10-K. This standard will impact the Corporation's disclosure relating to employee benefit plans, but the Corporation does not expect the adoption of this update to have a material impact on the consolidated financial statements. ASC Update 2019-12 Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes This update simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. First Quarter 2021 The Corporation intends to adopt this standards update effective with its March 31, 2021 quarterly report on Form 10-Q. This update is not expected to have a material impact on the consolidated financial statements. Reclassifications

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Values of Investment Securities	The following table presents the amortized cost and estimated fair values of investment securities for the periods presented: September 30, 2020 Amortized Gross Gross Estimated Available for Sale (in thousands) State and municipal securities $ 880,495 $ 46,216 $ (157) $ 926,554 Corporate debt securities 327,143 16,724 (1,309) 342,558 Collateralized mortgage obligations 516,312 16,207 (46) 532,473 Residential mortgage-backed securities 318,343 3,409 (57) 321,695 Commercial mortgage-backed securities 548,076 24,136 (2) 572,210 Auction rate securities 101,510 — (3,520) 97,990 Total $ 2,691,879 $ 106,692 $ (5,091) $ 2,793,480 Held to Maturity Residential mortgage-backed securities $ 304,241 $ 20,699 $ — $ 324,940 December 31, 2019 Amortized Gross Gross Estimated Available for Sale (in thousands) State and municipal securities $ 638,125 $ 15,826 $ (1,024) $ 652,927 Corporate debt securities 370,401 8,490 (1,534) 377,357 Collateralized mortgage obligations 682,307 11,726 (315) 693,718 Residential mortgage-backed securities 177,183 1,078 (949) 177,312 Commercial mortgage-backed securities 489,603 6,471 (1,777) 494,297 Auction rate securities 107,410 — (5,484) 101,926 Total $ 2,465,029 $ 43,591 $ (11,083) $ 2,497,537 Held to Maturity Residential mortgage-backed securities $ 369,841 $ 13,864 $ — $ 383,705
Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities	The amortized cost and estimated fair values of debt securities as of September 30, 2020, by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities as certain investment securities are subject to call or prepayment with or without call or prepayment penalties. September 30, 2020 Available for Sale Held to Maturity Amortized Estimated Amortized Estimated (in thousands) Due in one year or less $ 11,252 $ 11,388 $ — $ — Due from one year to five years 32,118 33,397 — — Due from five years to ten years 315,094 330,233 — — Due after ten years 950,684 992,084 — — 1,309,148 1,367,102 — — Residential mortgage-backed securities (1) 318,343 321,695 304,241 324,940 Commercial mortgage-backed securities (1) 548,076 572,210 — — Collateralized mortgage obligations (1) 516,312 532,473 — — Total $ 2,691,879 $ 2,793,480 $ 304,241 $ 324,940 (1) Mortgage-backed securities and collateralized mortgage obligations do not have stated maturities and are dependent upon the interest rate environment and prepayments on the underlying loans.
Summary of Gains and Losses from Equity and Debt Securities, and Losses Recognized from Other-than-Temporary Impairment	The following table presents information related to the gross realized gains and losses on the sales of investment securities for the periods presented: Gross Realized Gains Gross Realized Losses Net Gains Three months ended (in thousands) September 30, 2020 $ 94 $ (92) $ 2 September 30, 2019 7,938 (3,446) 4,492 Nine months ended September 30, 2020 $ 6,545 $ (3,492) $ 3,053 September 30, 2019 11,207 (6,474) 4,733
Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in Continuous Unrealized Loss Position	The following tables present the gross unrealized losses and estimated fair values of investment securities, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented: September 30, 2020 Less than 12 months 12 months or longer Total Number of Securities Estimated Unrealized Number of Securities Estimated Unrealized Estimated Unrealized Available for Sale (in thousands) State and municipal securities 6 $ 25,372 $ (157) — $ — $ — $ 25,372 $ (157) Corporate debt securities 16 67,030 (965) 1 6,847 (344) 73,877 (1,309) Collateralized mortgage obligations 1 25,489 (46) — — — 25,489 (46) Residential mortgage-backed securities 4 75,876 (57) — — — 75,876 (57) Commercial mortgage-backed securities 1 9,322 (2) — — — 9,322 (2) Auction rate securities — — — 162 97,990 (3,520) 97,990 (3,520) Total available for sale (1) 28 $ 203,089 $ (1,227) 163 $ 104,837 $ (3,864) $ 307,926 $ (5,091) December 31, 2019 Less than 12 months 12 months or longer Total Number of Securities Estimated Unrealized Number of Securities Estimated Unrealized Estimated Unrealized Available for Sale (in thousands) State and municipal securities 44 $ 136,344 $ (1,024) — $ — $ — $ 136,344 $ (1,024) Corporate debt securities 5 30,719 (346) 8 18,759 (1,188) 49,478 (1,534) Collateralized mortgage obligations 5 33,865 (190) 1 5,330 (125) 39,195 (315) Residential mortgage-backed securities 5 12,247 (40) 26 127,373 (909) 139,620 (949) Commercial mortgage-backed securities 7 121,340 (1,777) — — — 121,340 (1,777) Auction rate securities — — — 177 101,926 (5,484) 101,926 (5,484) Total available for sale (1) 66 $ 334,515 $ (3,377) 212 $ 253,388 $ (7,706) $ 587,903 $ (11,083)

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Summary of Gross Loans by Type	September 30, December 31, 2019 (in thousands) Real estate - commercial mortgage $ 7,046,330 $ 6,700,776 Commercial and industrial 5,968,154 4,446,701 Real-estate - residential mortgage 3,061,835 2,641,465 Real-estate - home equity 1,222,709 1,314,944 Real-estate - construction 1,007,534 971,079 Consumer 469,551 463,164 Equipment lease financing and other 274,570 322,625 Overdrafts 1,694 3,582 Gross loans 19,052,377 16,864,336 Unearned income (23,756) (26,810) Net Loans $ 19,028,621 $ 16,837,526
Activity in the Allowance for Credit Losses	The following table presents the activity in the ACL in 2020: Three months ended September 30, 2020 Nine months ended September 30, 2020 (in thousands) Balance at beginning of period $ 272,920 $ 166,209 Impact of adopting CECL on January 1, 2020 (1) — 58,348 Loans charged off (5,489) (27,539) Recoveries of loans previously charged off 7,847 14,660 Net loans recovered (charged off) 2,358 (12,879) Provision for credit losses (2) 7,080 70,680 Balance at end of period $ 282,358 $ 282,358 (1) Includes $12.6 million of reserves for OBS credit exposures as of January 1, 2020. (2) Includes $850,000 and $320,000 related to OBS credit exposures for the three and nine months ended September 30, 2020, respectively. The following table presents the activity in the ACL - loans by portfolio segment, for the three and nine months ended September 30, 2020: Real Estate - Commercial and Real Estate - Real Estate - Real Estate - Consumer Equipment lease financing, other Total (in thousands) Three months ended September 30, 2020 Balance at June 30, 2020 $ 102,695 $ 61,447 $ 16,391 $ 46,443 $ 12,314 $ 10,299 $ 6,948 $ 256,537 Loans charged off (746) (2,969) (393) (198) — (701) (483) (5,489) Recoveries of loans previously charged off 100 2,103 44 95 4,873 447 185 7,847 Net loans recovered (charged off) (646) (866) (349) (103) 4,873 (254) (298) 2,358 Provision for loan losses (1) 9,806 (1,743) 256 2,013 (2,177) 260 (484) 7,930 Balance at September 30, 2020 $ 111,855 $ 58,838 $ 16,298 $ 48,353 $ 15,010 $ 10,305 $ 6,166 $ 266,825 Nine months ended September 30, 2020 Balance at December 31, 2019 $ 45,610 $ 68,602 $ 17,744 $ 19,771 $ 4,443 $ 3,762 $ 3,690 $ 163,622 Impact of adopting CECL on January 1, 2020 29,361 (18,576) (65) 21,235 4,015 5,969 3,784 45,723 Loans charged off (3,925) (17,348) (1,138) (620) (17) (2,788) (1,704) (27,539) Recoveries of loans previously charged off 439 6,815 305 292 4,943 1,481 385 14,660 Net loans recovered (charged off) (3,486) (10,533) (833) (328) 4,926 (1,307) (1,319) (12,879) Provision for loan losses (1) 40,370 19,345 (548) 7,675 1,626 1,881 11 70,359 Balance at September 30, 2020 $ 111,855 $ 58,838 $ 16,298 $ 48,353 $ 15,010 $ 10,305 $ 6,166 $ 266,825 (1) Provision included in the table only includes the portion related to Net Loans. The following table presents the activity in the ACL for the periods indicated in 2019: Three months ended September 30, 2019 Nine months ended September 30, 2019 (in thousands) Balance at beginning of period $ 176,941 $ 169,410 Loans charged off (10,128) (20,208) Recoveries of loans previously charged off 3,814 11,300 Net loans charged off (6,314) (8,908) Provision for credit losses (1) 2,170 12,295 Balance at end of period $ 172,797 $ 172,797 (1) Includes ($46,000) and ($2.2 million) related to reserve for unfunded lending commitments for the three and nine months ended September 30, 2019, respectively. The following table presents the activity in the allowance for loan losses, by portfolio segment, for the three and nine months ended September 30, 2019: Real Estate - Commercial & Real Estate - Real Estate - Real Estate - Consumer Equipment lease financing, other Total (in thousands) Three months ended September 30, 2019 Balance at June 30, 2019 $ 54,859 $ 66,341 $ 18,981 $ 18,892 $ 4,928 $ 3,363 $ 2,869 $ 170,233 Loans charged off (394) (7,181) (498) (533) (45) (877) (600) (10,128) Recoveries of loans previously charged off 444 2,311 132 440 164 216 107 3,814 Net loans recovered (charged off) 50 (4,870) (366) (93) 119 (661) (493) (6,314) Provision for loan losses (1) (5,529) 7,710 (662) (109) (664) 798 672 2,216 Balance at September 30, 2019 $ 49,380 $ 69,181 $ 17,953 $ 18,690 $ 4,383 $ 3,500 $ 3,048 $ 166,135 Nine months ended September 30, 2019 Balance at December 31, 2018 $ 52,889 $ 58,868 $ 18,911 $ 18,921 $ 5,061 $ 3,217 $ 2,670 $ 160,537 Loans charged off (1,769) (11,863) (923) (1,322) (143) (2,355) (1,833) (20,208) Recoveries of loans previously charged off 749 6,234 552 783 1,493 1,005 484 11,300 Net loans recovered (charged off) (1,020) (5,629) (371) (539) 1,350 (1,350) (1,349) (8,908) Provision for loan losses (1) (2,489) 15,942 (587) 308 (2,028) 1,633 1,727 14,506 Balance at September 30, 2019 $ 49,380 $ 69,181 $ 17,953 $ 18,690 $ 4,383 $ 3,500 $ 3,048 $ 166,135 (1) The provision in the table only includes the portion related to Net Loans.
Schedule of Allowance for Credit Losses	The following table presents the components of the ACL under CECL: September 30, 2020 (in thousands) ACL - loans $ 266,825 ACL - OBS credit exposure 15,533 Total ACL $ 282,358 The following table presents the components of the ACL: December 31, 2019 (in thousands) Allowance for loan losses $ 163,622 Reserve for unfunded lending commitments 2,587 ACL $ 166,209
Total Impaired Loans by Class Segment	The following table presents total non-accrual loans, by class segment: September 30, 2020 December 31, 2019 Non-accrual Loans Non-accrual Loans With a Related Allowance Without a Related Allowance Total Total (in thousands) Real estate - commercial mortgage $ 15,145 $ 25,781 $ 40,926 $ 33,166 Commercial and industrial 14,326 20,948 35,274 48,106 Real estate - residential mortgage 23,637 1,256 24,893 16,676 Real estate - home equity 8,682 — 8,682 7,004 Real estate - construction 607 1,014 1,621 3,618 Consumer 235 — 235 — Equipment lease financing and other — 16,690 16,690 16,528 $ 62,632 $ 65,689 $ 128,321 $ 125,098
Financing Receivable Credit Quality Indicators	The following table summarizes designated internal risk categories by portfolio segment and loan class, by origination year, in the current period : September 30, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2020 2019 2018 2017 2016 Prior Cost Basis Cost Basis Total Real estate - construction (1) Pass $ 94,758 $ 243,614 $ 196,393 $ 138,308 $ 44,315 $ 114,228 $ 47,594 $ — $ 879,210 Special Mention — 241 — — 7,103 6,106 — — 13,450 Substandard or Lower — 448 — — 760 5,822 943 — 7,973 Total real estate - construction 94,758 244,303 196,393 138,308 52,178 126,156 48,537 — 900,633 Real estate - construction (1) Current period gross charge-offs — — — — — (17) — — (17) Current period recoveries — — — — 68 4,875 — — 4,943 Total net (charge-offs) recoveries — — — — 68 4,858 — — 4,926 Commercial and industrial Pass 2,409,273 540,493 330,516 229,184 216,228 635,782 1,256,763 — 5,618,239 Special Mention 52,203 13,653 7,618 10,886 13,693 29,919 50,673 — 178,645 Substandard or Lower 38,983 1,125 15,819 11,797 13,422 25,081 64,089 954 171,270 Total commercial and industrial 2,500,459 555,271 353,953 251,867 243,343 690,782 1,371,525 954 5,968,154 Commercial and industrial Current period gross charge-offs — (106) (10) (102) (388) (117) (16,625) — (17,348) Current period recoveries 39 364 207 91 1,704 4,410 — 6,815 Total net (charge-offs) recoveries — (67) 354 105 (297) 1,587 (12,215) — (10,533) Real estate - commercial mortgage Pass 702,768 933,999 792,029 850,926 871,759 2,381,373 88,116 327 6,621,297 Special Mention 13,247 13,505 19,298 33,245 46,354 139,832 3,502 — 268,983 Substandard or Lower 1,119 2,409 13,665 39,467 9,375 88,671 1,344 — 156,050 Total real estate - commercial mortgage 717,134 949,913 824,992 923,638 927,488 2,609,876 92,962 327 7,046,330 Real estate - commercial mortgage Current period gross charge-offs — (16) (36) (2,515) (29) (1,312) (17) — (3,925) Current period recoveries — — — — 1 438 — — 439 Total net (charge-offs) recoveries — (16) (36) (2,515) (28) (874) (17) — (3,486) Total Pass $ 3,206,799 $ 1,718,106 $ 1,318,938 $ 1,218,418 $ 1,132,302 $ 3,131,383 $ 1,392,473 $ 327 $ 13,118,746 Special Mention 65,450 27,399 26,916 44,131 67,150 175,857 54,175 — 461,078 Substandard or Lower 40,102 3,982 29,484 51,264 23,557 119,574 66,376 954 335,293 Total $ 3,312,351 $ 1,749,487 $ 1,375,338 $ 1,313,813 $ 1,223,009 $ 3,426,814 $ 1,513,024 $ 1,281 $ 13,915,117 (1) Excludes real estate - construction - other. The information presented in the table above is not required for periods prior to the adoption of CECL. The following table presents the most comparable required information for the prior period, internal credit risk ratings for the indicated loan class segments: December 31, 2019 Pass Special Mention Substandard or Lower Total (dollars in thousands) Real estate - commercial mortgage $ 6,429,407 $ 137,163 $ 134,206 $ 6,700,776 Commercial and industrial - secured 3,830,847 171,442 195,884 4,198,173 Commercial and industrial - unsecured 234,987 9,665 3,876 248,528 Total commercial and industrial 4,065,834 181,107 199,760 4,446,701 Construction - commercial residential 100,808 2,897 3,461 107,166 Construction - commercial 765,562 1,322 2,676 769,560 Total construction (excluding construction - other) 866,370 4,219 6,137 876,726 $ 11,361,611 $ 322,489 $ 340,103 $ 12,024,203 % of Total 94.5 % 2.7 % 2.8 % 100.0 % September 30, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2020 2019 2018 2017 2016 Prior Cost Basis Cost Basis Total Real estate - home equity Performing $ 21,247 $ 8,297 $ 14,573 $ 12,064 $ 13,006 $ 140,145 $ 995,811 $ 5,485 $ 1,210,628 Nonperforming — — 153 256 225 2,354 8,764 329 12,081 Total real estate - home equity 21,247 8,297 14,726 12,320 13,231 142,499 1,004,575 5,814 1,222,709 Real estate - home equity Current period gross charge-offs — — — — — — (1,137) — (1,137) Current period recoveries — — — — — 123 182 — 305 Total net (charge-offs) recoveries — — — — — 123 (955) — (832) Real estate - residential mortgage Performing 953,063 649,475 268,809 383,345 294,005 484,717 — — 3,033,414 Nonperforming — 832 2,437 2,611 723 21,818 — — 28,421 Total real estate - residential mortgage 953,063 650,307 271,246 385,956 294,728 506,535 — — 3,061,835 Real estate - residential mortgage Current period gross charge-offs — (68) (101) (190) (7) (254) — — (620) Current period recoveries — — 13 1 — 278 — — 292 Total net (charge-offs) recoveries — (68) (88) (189) (7) 24 — — (328) Consumer Performing 93,208 106,797 104,984 48,281 27,828 38,319 49,594 — 469,011 Nonperforming 123 68 56 62 47 162 22 — 540 Total consumer 93,331 106,865 105,040 48,343 27,875 38,481 49,616 — 469,551 Consumer Current period gross charge-offs — (500) (425) (346) (433) (642) (442) — (2,788) Current period recoveries — 48 148 116 177 891 101 — 1,481 Total net (charge-offs) recoveries — (452) (277) (230) (256) 249 (341) — (1,307) Equipment lease financing and other Performing 69,512 71,629 53,733 39,888 18,481 6,219 — — 259,462 Nonperforming — — 190 16,054 272 286 — — 16,802 Total leasing and other 69,512 71,629 53,923 55,942 18,753 6,505 — — 276,264 Equipment lease financing and other Current period gross charge-offs (1,463) (241) — — — — — — (1,704) Current period recoveries 187 136 17 16 9 20 — — 385 Total net (charge-offs) recoveries (1,276) (105) 17 16 9 20 — — (1,319) Construction - other Performing 45,386 36,764 6,614 — 16 — 17,940 — 106,720 Nonperforming — — — 181 — — — — 181 Total construction - other 45,386 36,764 6,614 181 16 — 17,940 — 106,901 Construction - other Current period gross charge-offs — — — — — — — — — Current period recoveries — — — — — — — — — Total net (charge-offs) recoveries — — — — — — — — — Total Performing $ 1,182,416 $ 872,962 $ 448,713 $ 483,578 $ 353,336 $ 669,400 $ 1,063,345 $ 5,485 $ 5,079,235 Nonperforming 123 900 2,836 19,164 1,267 24,620 8,786 329 58,025 Total $ 1,182,539 $ 873,862 $ 451,549 $ 502,742 $ 354,603 $ 694,020 $ 1,072,131 $ 5,814 $ 5,137,260 The information presented in the table above is not required for periods prior to the adoption of CECL. The following table presents the most comparable required information for the prior period, a summary of performing, delinquent and non-performing loans for the indicated class segments: December 31, 2019 Performing Delinquent (1) Non-performing (2) Total (dollars in thousands) Real estate - home equity $ 1,292,035 $ 12,341 $ 10,568 $ 1,314,944 Real estate - residential mortgage 2,584,763 34,291 22,411 2,641,465 Construction - other 92,649 895 809 94,353 Consumer - direct 63,582 465 190 64,237 Consumer - indirect 393,974 4,685 268 398,927 Total consumer 457,556 5,150 458 463,164 Equipment lease financing and other 278,743 4,012 16,642 299,397 $ 4,705,746 $ 56,689 $ 50,888 $ 4,813,323 % of Total 97.8 % 1.2 % 1.0 % 100 % (1) Includes all accruing loans 30 days to 89 days past due. (2) Includes all accruing loans 90 days or more past due and all non-accrual loans.
Non-Performing Assets	The following table presents non-performing assets: September 30, December 31, (in thousands) Non-accrual loans $ 128,321 $ 125,098 Loans 90 days or more past due and still accruing 13,761 16,057 Total non-performing loans 142,082 141,155 OREO (1) 4,565 6,831 Total non-performing assets $ 146,647 $ 147,986 (1) Excludes $9.6 million of residential mortgage properties for which formal foreclosure proceedings were in process as of September 30, 2020.
Past due Loan Status and Non-Accrual Loans by Portfolio Segment	The following tables present the aging of the amortized cost basis of loans, by class segment: 30-59 60-89 ≥ 90 Days Days Past Days Past Past Due Non- Due Due and Accruing Accrual Current Total (in thousands) September 30, 2020 Real estate – commercial mortgage $ 11,867 $ 3,702 $ 2,499 $ 40,926 $ 6,987,336 $ 7,046,330 Commercial and industrial 5,326 1,228 1,950 35,274 5,924,376 5,968,154 Real estate – residential mortgage 10,686 1,180 3,394 24,893 3,021,682 3,061,835 Real estate – home equity 3,966 902 3,070 8,682 1,206,089 1,222,709 Real estate – construction — — 2,430 1,621 1,003,483 1,007,534 Consumer 1,648 436 306 235 466,926 469,551 Equipment lease financing and other 250 110 112 16,690 235,346 252,508 Total $ 33,743 $ 7,558 $ 13,761 $ 128,321 $ 18,845,238 $ 19,028,621 30-59 Days Past 60-89 ≥ 90 Days Non- Current Total (in thousands) December 31, 2019 Real estate – commercial mortgage $ 10,912 $ 1,543 $ 4,113 $ 33,166 $ 6,651,042 $ 6,700,776 Commercial and industrial 2,302 2,630 1,385 48,106 4,392,278 4,446,701 Real estate – residential mortgage 26,982 7,309 5,735 16,676 2,584,763 2,641,465 Real estate – home equity 9,635 2,706 3,564 7,004 1,292,035 1,314,944 Real estate – construction 1,715 900 688 3,618 964,158 971,079 Consumer 4,228 922 458 — 457,556 463,164 Equipment lease financing and other 552 3,460 114 16,528 278,743 299,397 Total $ 56,326 $ 19,470 $ 16,057 $ 125,098 $ 16,620,575 $ 16,837,526
Troubled Debt Restructurings on Financing Receivables	The following table presents TDRs, by class segment: September 30, December 31, (in thousands) Real estate - residential mortgage $ 19,427 $ 21,551 Real estate - commercial mortgage 28,558 13,330 Real estate - home equity 14,875 15,068 Commercial and industrial 7,328 5,193 Consumer — 8 Total accruing TDRs 70,188 55,150 Non-accrual TDRs (1) 37,025 20,825 Total TDRs $ 107,213 $ 75,975 (1) Included in non-accrual loans in the preceding table detailing non-performing assets.
Loan Terms Modified Under Troubled Debt Restructurings	The following table presents TDRs, by class segment, for loans that were modified during the three and nine months ended September 30, 2020 and 2019: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Real estate - residential mortgage 8 $ 1,351 1 $ 830 48 $ 10,516 6 $ 2,263 Real estate - commercial mortgage 5 8,394 1 81 12 24,868 1 81 Real estate - home equity 13 1,370 12 327 40 3,556 46 2,281 Commercial and industrial 4 3,021 3 97 18 4,399 13 4,928 Consumer 3 53 — — 11 238 — — Total 33 $ 14,189 17 $ 1,335 129 $ 43,577 66 $ 9,553

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2020
Transfers and Servicing [Abstract]
Summary of Changes in Mortgage Servicing Rights	The following table summarizes the changes in MSRs, which are included in other assets on the consolidated balance sheets: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Amortized cost: Balance at beginning of period $ 38,692 $ 38,826 $ 39,267 $ 38,573 Originations of MSRs 4,319 2,499 8,569 5,585 Amortization (4,129) (1,970) (8,954) (4,803) Balance at end of period $ 38,882 $ 39,355 $ 38,882 $ 39,355 Valuation allowance: Balance at beginning of period $ (7,700) $ — $ — $ — Additions to valuation allowance (1,500) — (9,200) — Balance at end of period $ (9,200) $ — $ (9,200) $ — Net MSRs at end of period $ 29,682 $ 39,355 $ 29,682 $ 39,355 Estimated fair value of MSRs at end of period $ 29,682 $ 43,968 $ 29,682 $ 43,968

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Notional Amounts and Fair Values of Derivative Financial Instruments	The following table presents a summary of the notional amounts and fair values of derivative financial instruments: September 30, 2020 December 31, 2019 Notional Asset Notional Asset (in thousands) Interest Rate Locks with Customers Positive fair values $ 446,268 $ 11,994 $ 132,260 $ 1,123 Negative fair values 4,611 (61) 9,783 (53) Forward Commitments Positive fair values — — 75,000 63 Negative fair values 414,110 (1,644) 180,000 (371) Interest Rate Swaps with Customers Positive fair values 3,777,684 375,567 2,903,489 143,484 Negative fair values 12,288 (2) 376,705 (695) Interest Rate Swaps with Dealer Counterparties Positive fair values 12,288 2 376,705 695 Negative fair values 3,777,684 (183,225) 2,903,489 (75,327) Foreign Exchange Contracts with Customers Positive fair values 2,947 32 3,373 38 Negative fair values 5,885 (280) 7,283 (154) Foreign Exchange Contracts with Correspondent Banks Positive fair values 7,325 340 9,028 192 Negative fair values 2,653 (19) 4,976 (45)
Summary of Fair Value Gains and Losses on Derivative Financial Instruments	The following table presents a summary of the fair value gains (losses) on derivative financial instruments: Consolidated Statements of Income Classification Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Mortgage banking derivatives (1) Mortgage banking income $ 1,783 $ 843 $ 9,527 $ 1,457 Interest rate swaps Other expense (12) 51 70 198 Foreign exchange contracts Other income 25 10 42 44 Net fair value gains on derivative financial instruments $ 1,796 $ 904 $ 9,639 $ 1,699 (1) Includes interest rate locks with customers and forward commitments.
Summary of Corporation's Mortgage Loans Held for Sale	The following table presents a summary of mortgage loans held for sale and the impact of the fair value election on the consolidated financial statements as of the periods shown: September 30, December 31, (in thousands) Amortized cost (1) $ 90,416 $ 37,396 Fair value 93,621 37,828 (1) Cost basis of mortgage loans held for sale represents the unpaid principal balance.
Summary of Offsetting Derivative Assets	The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) September 30, 2020 Interest rate swap derivative assets $ 375,569 $ (2) $ — $ 375,567 Foreign exchange derivative assets with correspondent banks 340 (19) — 321 Total $ 375,909 $ (21) $ — $ 375,888 Interest rate swap derivative liabilities $ 183,230 $ (2) $ (183,228) $ — Foreign exchange derivative liabilities with correspondent banks 19 (19) — — Total $ 183,249 $ (21) $ (183,228) $ — December 31, 2019 Interest rate swap derivative assets $ 144,179 $ (757) $ — $ 143,422 Foreign exchange derivative assets with correspondent banks 192 (45) — 147 Total $ 144,371 $ (802) $ — $ 143,569 Interest rate swap derivative liabilities $ 76,022 $ (757) $ (75,265) $ — Foreign exchange derivative liabilities with correspondent banks 45 (45) — — Total $ 76,067 $ (802) $ (75,265) $ — (1) For interest rate swap assets, amounts represent any derivative liability fair values that could be offset in the event of counterparty or customer default. For interest rate swap liabilities, amounts represent any derivative asset fair values that could be offset in the event of counterparty or customer default. (2) Amounts represent cash collateral received from the counterparty or posted by the Corporation on interest rate swap transactions and foreign exchange contracts with financial institution counterparties. Interest rate swaps with customers are collateralized by the same collateral securing the underlying loans to those borrowers. Cash and securities collateral amounts are included in the table only to the extent of the net derivative fair values.
Summary of Offsetting Derivative Liabilities	The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) September 30, 2020 Interest rate swap derivative assets $ 375,569 $ (2) $ — $ 375,567 Foreign exchange derivative assets with correspondent banks 340 (19) — 321 Total $ 375,909 $ (21) $ — $ 375,888 Interest rate swap derivative liabilities $ 183,230 $ (2) $ (183,228) $ — Foreign exchange derivative liabilities with correspondent banks 19 (19) — — Total $ 183,249 $ (21) $ (183,228) $ — December 31, 2019 Interest rate swap derivative assets $ 144,179 $ (757) $ — $ 143,422 Foreign exchange derivative assets with correspondent banks 192 (45) — 147 Total $ 144,371 $ (802) $ — $ 143,569 Interest rate swap derivative liabilities $ 76,022 $ (757) $ (75,265) $ — Foreign exchange derivative liabilities with correspondent banks 45 (45) — — Total $ 76,067 $ (802) $ (75,265) $ — (1) For interest rate swap assets, amounts represent any derivative liability fair values that could be offset in the event of counterparty or customer default. For interest rate swap liabilities, amounts represent any derivative asset fair values that could be offset in the event of counterparty or customer default. (2) Amounts represent cash collateral received from the counterparty or posted by the Corporation on interest rate swap transactions and foreign exchange contracts with financial institution counterparties. Interest rate swaps with customers are collateralized by the same collateral securing the underlying loans to those borrowers. Cash and securities collateral amounts are included in the table only to the extent of the net derivative fair values.

Tax Credit Investments (Tables)

Tax Credit Investments (Tables)	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Summary Of Affordable Housing Tax Credit Investments And Other Credit Investments	The following table presents the balances of the Corporation's TCIs and related unfunded commitments: September 30, December 31, 2020 2019 Included in other assets: (in thousands) Affordable housing tax credit investment, net $ 145,415 $ 153,351 Other tax credit investments, net 70,379 64,354 Total TCIs, net $ 215,794 $ 217,705 Included in other liabilities: Unfunded affordable housing tax credit commitments $ 22,591 $ 16,684 Other tax credit liabilities 60,585 55,105 Total unfunded tax credit commitments and liabilities $ 83,176 $ 71,789 The following table presents other information relating to the Corporation's TCIs: Three Months Ended Nine Months Ended September 30 September 30 2020 2019 2020 2019 Components of income taxes: (in thousands) Affordable housing tax credits and other tax benefits $ (7,290) $ (7,852) $ (21,678) $ (23,002) Other tax credit investment credits and tax benefits (1,240) (1,136) (3,122) (3,407) Amortization of affordable housing investments, net of tax benefit 5,024 5,649 15,071 16,638 Deferred tax expense 275 238 691 715 Total net reduction in income tax expense $ (3,231) $ (3,101) $ (9,038) $ (9,056) Amortization of TCIs: Affordable housing tax credits investment $ 1,021 $ 863 $ 3,065 $ 2,508 Other tax credit investment amortization 673 670 1,529 2,008 Total amortization of TCIs $ 1,694 $ 1,533 $ 4,594 $ 4,516

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Changes in other comprehensive income	The following table presents changes in other comprehensive income: Before-Tax Amount Tax Effect Net of Tax Amount Three months ended September 30, 2020 (in thousands) Unrealized gain on securities $ 5,565 $ (1,232) $ 4,333 Reclassification adjustment for securities gains included in net income (1) (2) 1 (1) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 1,192 (264) 928 Amortization of net unrecognized pension and postretirement items (3) 329 (73) 255 Total Other Comprehensive Income $ 7,083 $ (1,568) $ 5,515 Three months ended September 30, 2019 Unrealized gain on securities (4) $ 23,150 $ (5,121) $ 18,029 Reclassification adjustment for securities gains included in net income (1) (4,492) 994 (3,498) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 4,405 (974) 3,430 Amortization of net unrecognized pension and postretirement items (3) 357 (80) 277 Total Other Comprehensive Income $ 23,419 $ (5,181) $ 18,238 Nine months ended September 30, 2020 Unrealized gain on securities $ 72,146 $ (15,960) $ 56,186 Reclassification adjustment for securities gains included in net income (1) (3,053) 676 (2,377) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 3,232 (715) 2,517 Amortization of net unrecognized pension and postretirement items (3) 984 (219) 765 Total Other Comprehensive Income $ 73,309 $ (16,218) $ 57,091 Nine months ended September 30, 2019 Unrealized gain on securities (4) $ 81,207 $ (17,963) $ 63,244 Reclassification adjustment for securities gains included in net income (1) (4,733) 1,047 (3,686) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 6,966 (1,541) 5,425 Non-credit related unrealized losses on other-than-temporarily impaired debt securities (875) 193 (682) Amortization of net unrecognized pension and postretirement items (3) 1,083 (240) 843 Total Other Comprehensive Income $ 83,648 $ (18,504) $ 65,144 (1) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Investment securities gains, net" on the Consolidated Statements of Income. See Note 3, "Investment Securities," for additional details. (2) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included as a reduction to "Interest Income" on the Consolidated Statements of Income. (3) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Salaries and employee benefits" on the Consolidated Statements of Income. See Note 12, "Employee Benefit Plans," for additional details. (4) Before-Tax amount includes a $3.7 million reclassification of unrealized loss related to the early adoption of ASU 2019-04.
Changes in each component of accumulated other comprehensive income	The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax: Unrealized Gains (Losses) on Investment Securities Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities Unrecognized Pension and Postretirement Plan Income (Costs) Total (in thousands) Three months ended September 30, 2020 Balance at June 30, 2020 $ 65,930 $ — $ (14,491) $ 51,439 Other comprehensive income before reclassifications 4,333 — — 4,333 Amounts reclassified from accumulated other comprehensive income (1) — 255 254 Amortization of net unrealized losses on AFS securities transferred to HTM 928 — — 928 Balance at September 30, 2020 $ 71,190 $ — $ (14,236) $ 56,954 Three months ended September 30, 2019 Balance at June 30, 2019 $ 2,368 $ (2) $ (14,523) $ (12,157) Other comprehensive income before reclassifications 18,029 — — 18,029 Amounts reclassified from accumulated other comprehensive income (loss) (3,498) — 277 (3,221) Amortization of net unrealized losses on AFS securities transferred to HTM 3,430 — — 3,430 Balance at September 30, 2019 $ 20,329 $ (2) $ (14,246) $ 6,081 Nine months ended September 30, 2020 Balance at December 31, 2019 $ 14,864 $ — $ (15,001) $ (137) Other comprehensive income before reclassifications 56,186 — — 56,186 Amounts reclassified from accumulated other comprehensive income (loss) (2,377) — 765 (1,612) Amortization of net unrealized losses on AFS securities transferred to HTM 2,517 — — 2,517 Balance at September 30, 2020 $ 71,190 $ — $ (14,236) $ 56,954 Nine months ended September 30, 2019 Balance at December 31, 2018 $ (44,654) $ 680 $ (15,089) $ (59,063) Other comprehensive income before reclassifications 63,244 (682) — 62,562 Amounts reclassified from accumulated other comprehensive income (loss) (3,686) — 843 (2,843) Amortization of net unrealized losses on AFS securities transferred to HTM 5,425 — — 5,425 Balance at September 30, 2019 $ 20,329 $ (2) $ (14,246) $ 6,081

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present assets and liabilities measured at fair value on a recurring basis and reported on the consolidated balance sheets: September 30, 2020 Level 1 Level 2 Level 3 Total (in thousands) Loans held for sale $ — $ 93,621 $ — $ 93,621 Available for sale investment securities: State and municipal securities — 926,554 — 926,554 Corporate debt securities — 342,558 — 342,558 Collateralized mortgage obligations — 532,473 — 532,473 Residential mortgage-backed securities — 321,695 — 321,695 Commercial mortgage-backed securities — 572,210 — 572,210 Auction rate securities — — 97,990 97,990 Total available for sale investment securities — 2,695,490 97,990 2,793,480 Other assets: Investments held in Rabbi Trust 21,828 — — 21,828 Derivative assets 372 387,563 — 387,935 Total assets $ 22,200 $ 3,176,674 $ 97,990 $ 3,296,864 Other liabilities: Deferred compensation liabilities $ 21,828 $ — $ — $ 21,828 Derivative liabilities 299 184,932 — 185,231 Total liabilities $ 22,127 $ 184,932 $ — $ 207,059 December 31, 2019 Level 1 Level 2 Level 3 Total (in thousands) Loans held for sale $ — $ 37,828 $ — $ 37,828 Available for sale investment securities: State and municipal securities — 652,927 — 652,927 Corporate debt securities — 374,957 2,400 377,357 Collateralized mortgage obligations — 693,718 — 693,718 Residential mortgage-backed securities — 177,312 — 177,312 Commercial mortgage-backed securities — 494,297 — 494,297 Auction rate securities — — 101,926 101,926 Total available for sale investment securities — 2,393,211 104,326 2,497,537 Other assets: Investments held in Rabbi Trust 22,213 — — 22,213 Derivative assets 230 145,365 — 145,595 Total assets $ 22,443 $ 2,576,404 $ 104,326 $ 2,703,173 Other liabilities: Deferred compensation liabilities $ 22,213 $ — $ — $ 22,213 Derivative liabilities 199 76,447 — 76,646 Total liabilities $ 22,412 $ 76,447 $ — $ 98,859
Schedule of Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Level 3 Inputs	The following table presents the changes in the Corporation’s available for sale investment securities measured at fair value on a recurring basis using unobservable inputs (Level 3): Pooled Trust Single-issuer ARCs Three months ended September 30, 2020 (in thousands) Balance at June 30, 2020 $ — $ — $ 100,859 Sales — — — Unrealized adjustment to fair value (1) — — (2,869) Balance at September 30, 2020 $ — $ — $ 97,990 Three months ended September 30, 2019 Balance at June 30, 2019 $ — $ 2,370 $ 103,365 Unrealized adjustment to fair value (1) — (2) (67) Discount accretion — 2 — Balance at September 30, 2019 $ — $ 2,370 $ 103,298 Nine months ended September 30, 2020 Balance at December 31, 2019 $ — $ 2,400 $ 101,926 Sales — (2,160) — Unrealized adjustment to fair value (1) — (242) (3,936) Discount accretion — 2 — Balance at September 30, 2020 $ — $ — $ 97,990 Nine months ended September 30, 2019 Balance at December 31, 2018 $ 875 $ 2,400 $ 102,994 Sales (770) — — Unrealized adjustment to fair value (1) (105) (32) 304 Discount accretion — 2 — Balance at September 30, 2019 $ — $ 2,370 $ 103,298 (1) Pooled trust preferred securities, single-issuer trust preferred securities and ARCs are classified as available for sale investment securities; as such, the unrealized adjustment to fair value was recorded as an unrealized holding gain (loss) and included as a component of "available for sale at estimated fair value" on the consolidated balance sheets.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis	The following table presents Level 3 financial assets measured at fair value on a nonrecurring basis: September 30, 2020 December 31, 2019 (in thousands) Net Loans $ 113,073 $ 144,807 OREO 4,565 6,831 MSRs (1) 29,682 45,193 Total assets $ 147,320 $ 196,831
Details of Book Value and Fair Value of Financial Instruments	he following tables present the carrying amounts and estimated fair values of the Corporation’s financial instruments as of the periods shown. A general description of the methods and assumptions used to estimate such fair values follows: September 30, 2020 Estimated Fair Value Carrying Amount Level 1 Level 2 Level 3 Total (in thousands) FINANCIAL ASSETS Cash and cash equivalents $ 1,534,890 $ 1,534,890 $ — $ — $ 1,534,890 FRB and FHLB stock 93,964 — 93,964 — 93,964 Loans held for sale 93,621 — 93,621 — 93,621 AFS securities 2,793,480 — 2,695,490 97,990 2,793,480 HTM securities 304,241 — 324,940 — 324,940 Net Loans 18,761,796 — — 18,514,547 18,514,547 Accrued interest receivable 70,766 70,766 — — 70,766 Other assets 694,442 272,632 387,563 34,247 694,442 FINANCIAL LIABILITIES Demand and savings deposits $ 17,997,443 $ 17,997,443 $ — $ — $ 17,997,443 Brokered deposits 317,588 275,719 41,869 — 317,588 Time deposits 2,415,020 — 2,442,422 — 2,442,422 Short-term borrowings 611,727 611,727 — — 611,727 Accrued interest payable 9,123 9,123 — — 9,123 FHLB advances and long-term debt 1,296,012 — 1,342,192 — 1,342,192 Other liabilities 352,740 152,272 184,935 15,533 352,740 December 31, 2019 Estimated Fair Value Carrying Amount Level 1 Level 2 Level 3 Total (in thousands) FINANCIAL ASSETS Cash and cash equivalents $ 517,791 $ 517,791 $ — $ — $ 517,791 FRB and FHLB stock 97,422 — 97,422 — 97,422 Loans held for sale 37,828 — 37,828 — 37,828 AFS securities 2,497,537 — 2,393,211 104,326 2,497,537 HTM securities 369,841 — 383,705 — 383,705 Net Loans 16,673,904 — — 16,485,122 16,485,122 Accrued interest receivable 60,898 60,898 — — 60,898 Other assets 431,565 234,176 145,365 52,024 431,565 FINANCIAL LIABILITIES Demand and savings deposits $ 14,327,453 $ 14,327,453 $ — $ — $ 14,327,453 Brokered deposits 264,531 223,982 40,549 — 264,531 Time deposits 2,801,930 — 2,828,988 — 2,828,988 Short-term borrowings 883,241 883,241 — — 883,241 Accrued interest payable 8,834 8,834 — — 8,834 FHLB advances and long-term debt 881,769 — 878,385 — 878,385 Other liabilities 221,542 142,508 76,447 2,587 221,542

Net Income Per Share (Tables)

Net Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Reconciliation of Weighted Average Common Shares Outstanding	A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows (in thousands, except per share data): Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 Weighted average shares outstanding (basic) 162,061 165,324 162,416 167,834 Impact of common stock equivalents 518 802 667 888 Weighted average shares outstanding (diluted) 162,579 166,126 163,083 168,722 Per share: Basic $ 0.38 $ 0.38 $ 0.78 $ 1.06 Diluted 0.38 0.37 0.78 1.06

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Summary of Compensation Expense and Related Tax Benefits	The following table presents compensation expense and the related tax benefits for equity awards recognized in the consolidated statements of income: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Compensation expense $ 1,875 $ 2,110 $ 5,403 $ 5,458 Tax benefit (397) (451) (1,144) (1,194) Stock-based compensation expense, net of tax benefit $ 1,478 $ 1,659 $ 4,259 $ 4,264

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures	The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Interest cost $ 681 $ 813 $ 2,043 $ 2,443 Expected return on plan assets (982) (688) (2,946) (2,066) Net amortization and deferral 465 496 1,395 1,486 Net periodic pension cost $ 164 $ 621 $ 492 $ 1,863 The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components: Three months ended September 30 Nine months ended September 30 2020 2019 2020 2019 (in thousands) Interest cost $ 11 $ 15 $ 33 $ 45 Net accretion and deferral (137) (139) (411) (417) Net periodic benefit $ (126) $ (124) $ (378) $ (372)

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Summary of Outstanding Commitments to Extend Credit and Letters of Credit	The outstanding amounts of commitments to extend credit and letters of credit were as follows: September 30, December 31, 2019 (in thousands) Commitments to extend credit $ 8,325,169 $ 6,689,519 Standby letters of credit 294,429 303,020 Commercial letters of credit 54,112 50,432

Basis of Presentation Narrative

Basis of Presentation Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL	$ 282,358	$ 272,920		$ 166,209	$ 172,797	$ 176,941	$ 169,410
Change in retained earnings	(1,099,684)			(1,079,391)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL		$ 0	$ 58,348
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL			58,300
Change in retained earnings			43,800
Increase in deferred tax assets			12,400
Residential Mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL for certain OBS credit exposure	$ 1,100			$ 3,200
Residential Mortgage | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL for certain OBS credit exposure			(2,100)
Residential Mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL for certain OBS credit exposure			$ (2,100)

Restrictions on Cash and Cash_2

Restrictions on Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Collateral	$ 460.3	$ 199.6
Subsidiaries
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash reserves due from subsidiary		$ 218.9

Investment Securities Schedule

Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Amortized Cost	$ 2,691,879
Gross Unrealized Gains	106,692
Gross Unrealized Losses	(5,091)
Estimated Fair Value	2,793,480	$ 2,497,537
Amortized Cost, Held to Maturity	304,241	369,841
HTM securities	324,940
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	880,495
Gross Unrealized Gains	46,216
Gross Unrealized Losses	(157)
Estimated Fair Value	926,554
Amortized Cost		638,125
Gross Unrealized Gains		15,826
Gross Unrealized Losses		(1,024)
Estimated Fair Value		652,927
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	327,143
Gross Unrealized Gains	16,724
Gross Unrealized Losses	(1,309)
Estimated Fair Value	342,558
Amortized Cost		370,401
Gross Unrealized Gains		8,490
Gross Unrealized Losses		(1,534)
Estimated Fair Value		377,357
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	516,312
Gross Unrealized Gains	16,207
Gross Unrealized Losses	(46)
Estimated Fair Value	532,473
Amortized Cost		682,307
Gross Unrealized Gains		11,726
Gross Unrealized Losses		(315)
Estimated Fair Value		693,718
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	318,343
Gross Unrealized Gains	3,409
Gross Unrealized Losses	(57)
Estimated Fair Value	321,695
Amortized Cost, Held to Maturity	304,241	369,841
Gross Unrealized Gains, Held to Maturity	20,699	13,864
Gross Unrealized Losses, Held to Maturity	0	0
HTM securities	324,940	383,705
Amortized Cost		177,183
Gross Unrealized Gains		1,078
Gross Unrealized Losses		(949)
Estimated Fair Value		177,312
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	548,076
Gross Unrealized Gains	24,136
Gross Unrealized Losses	(2)
Estimated Fair Value	572,210
Amortized Cost		489,603
Gross Unrealized Gains		6,471
Gross Unrealized Losses		(1,777)
Estimated Fair Value		494,297
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	101,510
Gross Unrealized Gains	0
Gross Unrealized Losses	(3,520)
Estimated Fair Value	$ 97,990
Amortized Cost		107,410
Gross Unrealized Gains		0
Gross Unrealized Losses		(5,484)
Estimated Fair Value		101,926
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		2,465,029
Gross Unrealized Gains		43,591
Gross Unrealized Losses		(11,083)
Estimated Fair Value		$ 2,497,537

Investment Securities Schedul_2

Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 11,252
Due from one year to five years	32,118
Due from five years to ten years	315,094
Due after ten years	950,684
Amortized cost, before securities without debt maturities	1,309,148
Amortized Cost	2,691,879
Estimated Fair Value
Due in one year or less	11,388
Due from one year to five years	33,397
Due from five years to ten years	330,233
Due after ten years	992,084
Available for sale securities, debt maturities, before securities without single maturities	1,367,102
Estimated Fair Value	2,793,480	$ 2,497,537
Amortized Cost
Due in one year or less	0
Due from one year to five years	0
Due from five years to ten years	0
Due after ten years	0
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total	0
Amortized Cost, Held to Maturity	304,241	369,841
Estimated Fair Value
Due in one year or less	0
Due from one year to five years	0
Due from five years to ten years	0
Due after ten years	0
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value	0
Estimated Fair Value, Held to Maturity	324,940
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	516,312
Amortized Cost	516,312
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	532,473
Estimated Fair Value	532,473
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	0
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	0
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	548,076
Amortized Cost	548,076
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	572,210
Estimated Fair Value	572,210
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	0
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	0
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	318,343
Amortized Cost	318,343
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	321,695
Estimated Fair Value	321,695
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	304,241
Amortized Cost, Held to Maturity	304,241	369,841
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	324,940
Estimated Fair Value, Held to Maturity	$ 324,940	$ 383,705

Investment Securities Summary o

Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gain (Loss) on Securities [Line Items]
Debt securities, Gross Realized Gains	$ 94	$ 7,938	$ 6,545	$ 11,207
Debt securities, Gross Realized Losses	(92)	(3,446)	(3,492)	(6,474)
Debt securities, Net Gains (Losses)	$ 2	$ 4,492	$ 3,053	$ 4,733

Investment Securities Gross Unr

Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2020USD ($)Security	Dec. 31, 2019USD ($)Security
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	28	66
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 203,089	$ 334,515
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,227)	$ (3,377)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	163	212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 104,837	$ 253,388
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(3,864)	(7,706)
Debt Securities, Available-for-sale, Unrealized Loss Position	307,926	587,903
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (5,091)	$ (11,083)
State and Municipal Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	6	44
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 25,372	$ 136,344
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (157)	$ (1,024)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	25,372	136,344
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (157)	$ (1,024)
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	16	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 67,030	$ 30,719
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (965)	$ (346)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	1	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 6,847	$ 18,759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(344)	(1,188)
Debt Securities, Available-for-sale, Unrealized Loss Position	73,877	49,478
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (1,309)	$ (1,534)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	1	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 25,489	$ 33,865
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (46)	$ (190)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 5,330
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	(125)
Debt Securities, Available-for-sale, Unrealized Loss Position	25,489	39,195
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (46)	$ (315)
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	4	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 75,876	$ 12,247
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (57)	$ (40)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0	26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 127,373
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	(909)
Debt Securities, Available-for-sale, Unrealized Loss Position	75,876	139,620
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (57)	$ (949)
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	1	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 9,322	$ 121,340
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (2)	$ (1,777)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	9,322	121,340
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (2)	$ (1,777)
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	162	177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 97,990	$ 101,926
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(3,520)	(5,484)
Debt Securities, Available-for-sale, Unrealized Loss Position	97,990	101,926
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (3,520)	$ (5,484)

Investment Securities Summary_2

Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,691,879
Estimated Fair Value	2,793,480	$ 2,497,537
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	327,143
Estimated Fair Value	$ 342,558

Investment Securities Narrative

Investment Securities Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jul. 01, 2019
Schedule of Investments [Line Items]
Amortized cost	$ 2,691,879			$ 2,691,879
Available-for-sale Securities, Fair Value Disclosure	2,793,480			2,793,480		$ 2,497,537
HTM, at amortized cost	304,241			304,241		369,841
HTM securities	324,940			324,940
Prepayment penalty on FHLB advances	0		$ 4,326	2,878	$ 4,326
Debt Securities [Member]
Schedule of Investments [Line Items]
HTM, at amortized cost	79,000		409,200	79,000	409,200
HTM securities	82,000		413,700	82,000	$ 413,700
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss)		$ 3,000	4,500
Prepayment penalty on FHLB advances		$ 2,900	$ 4,300
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	318,343			318,343
Available-for-sale Securities, Fair Value Disclosure	321,695			321,695
HTM, at amortized cost	304,241			304,241		369,841
HTM securities	324,940			324,940		383,705
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	880,495			880,495
Available-for-sale Securities, Fair Value Disclosure	926,554			926,554
US States and Political Subdivisions Debt Securities [Member] | Accounting Standards Update 2019-04
Schedule of Investments [Line Items]
HTM, at amortized cost							$ 158,900
HTM securities							$ 168,500
Collateral Pledged [Member]
Schedule of Investments [Line Items]
Securities pledged as collateral	$ 568,400			$ 568,400		$ 462,600

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 19,052,377	$ 16,864,336
Unearned income	(23,756)	(26,810)
Net Loans	19,028,621	16,837,526
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	7,046,330	6,700,776
Net Loans	7,046,330	6,700,776
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	5,968,154	4,446,701
Net Loans	5,968,154	4,446,701
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,061,835	2,641,465
Net Loans	3,061,835	2,641,465
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,222,709	1,314,944
Net Loans	1,222,709	1,314,944
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,007,534	971,079
Net Loans	1,007,534	971,079
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	469,551	463,164
Net Loans	469,551	463,164
Equipment lease financing and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	274,570	322,625
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 1,694	$ 3,582

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
ACL - loans	$ 266,825		$ 163,622	$ 166,135	$ 170,233	$ 160,537
ACL - OBS credit exposure	15,533		2,587
Total ACL	$ 282,358	$ 272,920	$ 166,209	$ 172,797	$ 176,941	$ 169,410

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 272,920	$ 166,209
Loans charged off	5,489	27,539
Recoveries of loans previously charged off	7,847	14,660
Total net (charge-offs) recoveries	2,358	12,879
Provision for credit losses	7,080	70,680
Ending balance	282,358	282,358
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0
Off-Balance Sheet
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses	$ 850	320
Off-Balance Sheet | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		$ 12,600

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 272,920	$ 176,941	$ 166,209	$ 169,410
Loans charged off	5,489		27,539
Recoveries of loans previously charged off	7,847		14,660
Total net (charge-offs) recoveries	2,358		12,879
Provision for credit losses	7,080		70,680
Ending balance	282,358	172,797	282,358	172,797
Beginning balance		170,233	163,622	160,537
Loans charged off		(10,128)		(20,208)
Recovery of loans previously charged off		3,814		11,300
Net loans recovered (charged off)		(6,314)		(8,908)
Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments		2,216		14,506
Ending balance	266,825	166,135	266,825	166,135
Provision for Loan and Lease Losses	7,080	2,170	70,680	12,295
Financing Receivable, Allowance for Credit Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loan and Lease Losses	46,000		2,200
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		54,859		52,889
Loans charged off		(394)		(1,769)
Recovery of loans previously charged off		444		749
Net loans recovered (charged off)		50		(1,020)
Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments		(5,529)		(2,489)
Ending balance		49,380		49,380
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		66,341		58,868
Loans charged off		(7,181)		(11,863)
Recovery of loans previously charged off		2,311		6,234
Net loans recovered (charged off)		(4,870)		(5,629)
Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments		7,710		15,942
Ending balance		69,181		69,181
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		18,981		18,911
Loans charged off		(498)		(923)
Recovery of loans previously charged off		132		552
Net loans recovered (charged off)		(366)		(371)
Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments		(662)		(587)
Ending balance		17,953		17,953
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		18,892		18,921
Loans charged off		(533)		(1,322)
Recovery of loans previously charged off		440		783
Net loans recovered (charged off)		(93)		(539)
Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments		(109)		308
Ending balance		18,690		18,690
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		4,928		5,061
Loans charged off		(45)		(143)
Recovery of loans previously charged off		164		1,493
Net loans recovered (charged off)		119		1,350
Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments		(664)		(2,028)
Ending balance		4,383		4,383
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		3,363		3,217
Loans charged off		(877)		(2,355)
Recovery of loans previously charged off		216		1,005
Net loans recovered (charged off)		(661)		(1,350)
Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments		798		1,633
Ending balance		3,500		3,500
Equipment lease financing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		2,869		2,670
Loans charged off		(600)		(1,833)
Recovery of loans previously charged off		107		484
Net loans recovered (charged off)		(493)		(1,349)
Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments		672		1,727
Ending balance		$ 3,048		$ 3,048
Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	0
Loans - Excluding OBS Credit Exposure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	256,537		163,622
Loans charged off	5,489		27,539
Recoveries of loans previously charged off	7,847		14,660
Total net (charge-offs) recoveries	2,358		12,879
Provision for credit losses	7,930		70,359
Ending balance	266,825		266,825
Loans - Excluding OBS Credit Exposure [Member] | Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	102,695		45,610
Loans charged off	746		3,925
Recoveries of loans previously charged off	100		439
Total net (charge-offs) recoveries	646		3,486
Provision for credit losses	9,806		40,370
Ending balance	111,855		111,855
Loans - Excluding OBS Credit Exposure [Member] | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	61,447		68,602
Loans charged off	2,969		17,348
Recoveries of loans previously charged off	2,103		6,815
Total net (charge-offs) recoveries	866		10,533
Provision for credit losses	(1,743)		19,345
Ending balance	58,838		58,838
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	16,391		17,744
Loans charged off	393		1,138
Recoveries of loans previously charged off	44		305
Total net (charge-offs) recoveries	349		833
Provision for credit losses	256		(548)
Ending balance	16,298		16,298
Loans - Excluding OBS Credit Exposure [Member] | Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	46,443		19,771
Loans charged off	198		620
Recoveries of loans previously charged off	95		292
Total net (charge-offs) recoveries	103		328
Provision for credit losses	2,013		7,675
Ending balance	48,353		48,353
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	12,314		4,443
Loans charged off	0		17
Recoveries of loans previously charged off	4,873		4,943
Total net (charge-offs) recoveries	4,873		4,926
Provision for credit losses	(2,177)		1,626
Ending balance	15,010		15,010
Loans - Excluding OBS Credit Exposure [Member] | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	10,299		3,762
Loans charged off	701		2,788
Recoveries of loans previously charged off	447		1,481
Total net (charge-offs) recoveries	254		1,307
Provision for credit losses	260		1,881
Ending balance	10,305		10,305
Loans - Excluding OBS Credit Exposure [Member] | Equipment lease financing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	6,948		3,690
Loans charged off	483		1,704
Recoveries of loans previously charged off	185		385
Total net (charge-offs) recoveries	298		1,319
Provision for credit losses	(484)		11
Ending balance	$ 6,166		6,166
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			45,723
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			29,361
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			(18,576)
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			(65)
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			21,235
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			4,015
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			5,969
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Equipment lease financing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			$ 3,784

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	$ 62,632
Unpaid principal balance, with no related allowance	65,689
Unpaid Principal Balance	128,321	$ 125,098
Real estate - commercial mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	15,145
Unpaid principal balance, with no related allowance	25,781
Unpaid Principal Balance	40,926	33,166
Commercial
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	14,326
Unpaid principal balance, with no related allowance	20,948
Unpaid Principal Balance	35,274	48,106
Real estate - residential mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	23,637
Unpaid principal balance, with no related allowance	1,256
Unpaid Principal Balance	24,893	16,676
Construction
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	607
Unpaid principal balance, with no related allowance	1,014
Unpaid Principal Balance	1,621	3,618
Real-estate - home equity
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	8,682
Unpaid principal balance, with no related allowance	0
Unpaid Principal Balance	8,682	7,004
Consumer
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	235
Unpaid principal balance, with no related allowance	0
Unpaid Principal Balance	235	0
Equipment lease financing, other and overdrafts
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	0
Unpaid principal balance, with no related allowance	16,690
Unpaid Principal Balance	$ 16,690	$ 16,528

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Total
Current period gross charge-offs	$ (5,489)	$ (27,539)
Current period recoveries	7,847	14,660
Total net (charge-offs) recoveries	2,358	12,879
Gross loans	19,052,377	19,052,377	$ 16,864,336
Real-estate - home equity
Total
Gross loans	1,222,709	1,222,709	1,314,944
Real estate - residential mortgage
Total
Gross loans	3,061,835	3,061,835	2,641,465
Consumer
Total
Gross loans	469,551	469,551	463,164
Commercial and industrial
Total
Gross loans	5,968,154	5,968,154	4,446,701
Commercial and industrial | Pass
Total
Gross loans			4,065,834
Commercial and industrial | Special Mention
Total
Gross loans			181,107
Commercial and industrial | Substandard or Lower
Total
Gross loans			199,760
Real estate - commercial mortgage
Total
Gross loans	7,046,330	7,046,330	6,700,776
Real estate - commercial mortgage | Pass
Total
Gross loans			6,429,407
Real estate - commercial mortgage | Special Mention
Total
Gross loans			137,163
Real estate - commercial mortgage | Substandard or Lower
Total
Gross loans			134,206
Commercial
Total
Gross loans			4,198,173
Commercial | Pass
Total
Gross loans			3,830,847
Commercial | Special Mention
Total
Gross loans			171,442
Commercial | Substandard or Lower
Total
Gross loans			195,884
Commercial - unsecured
Total
Gross loans			248,528
Commercial - unsecured | Pass
Total
Gross loans			234,987
Commercial - unsecured | Special Mention
Total
Gross loans			9,665
Commercial - unsecured | Substandard or Lower
Total
Gross loans			3,876
Construction
Total
Gross loans			107,166
Construction | Pass
Total
Gross loans			100,808
Construction | Special Mention
Total
Gross loans			2,897
Construction | Substandard or Lower
Total
Gross loans			3,461
Construction - commercial
Total
Gross loans			769,560
Construction - commercial | Pass
Total
Gross loans			765,562
Construction - commercial | Special Mention
Total
Gross loans			1,322
Construction - commercial | Substandard or Lower
Total
Gross loans			2,676
Total construction (excluding construction - other)
Total
Gross loans			876,726
Total construction (excluding construction - other) | Pass
Total
Gross loans			866,370
Total construction (excluding construction - other) | Special Mention
Total
Gross loans			4,219
Total construction (excluding construction - other) | Substandard or Lower
Total
Gross loans			6,137
Commercial Loans, Commerical Mortgages, Constructions Loans
Total
Gross loans			$ 12,024,203
Percentage of total loans rated			100.00%
Commercial Loans, Commerical Mortgages, Constructions Loans | Pass
Total
Gross loans			$ 11,361,611
Percentage of total loans rated			94.50%
Commercial Loans, Commerical Mortgages, Constructions Loans | Special Mention
Total
Gross loans			$ 322,489
Percentage of total loans rated			2.70%
Commercial Loans, Commerical Mortgages, Constructions Loans | Substandard or Lower
Total
Gross loans			$ 340,103
Percentage of total loans rated			2.80%
Payment Activity, Aging Status [Member]
2020
Total	1,182,539	1,182,539
2019
Total	873,862	873,862
2018
Total	451,549	451,549
2017
Total	502,742	502,742
2016
Total	354,603	354,603
Prior
Total	694,020	694,020
Revolving Loans Amortized Cost Basis
Total	1,072,131	1,072,131
Total
Total	5,137,260	5,137,260
Gross loans			$ 4,813,323
Percentage of total loans rated			100.00%
Payment Activity, Aging Status [Member] | Performing
2020
Total	1,182,416	1,182,416
2019
Total	872,962	872,962
2018
Total	448,713	448,713
2017
Total	483,578	483,578
2016
Total	353,336	353,336
Prior
Total	669,400	669,400
Revolving Loans Amortized Cost Basis
Total	1,063,345	1,063,345
Total
Total	5,079,235	5,079,235
Gross loans			$ 4,705,746
Percentage of total loans rated			97.80%
Payment Activity, Aging Status [Member] | Delinquent
Total
Gross loans			$ 56,689
Percentage of total loans rated			1.20%
Payment Activity, Aging Status [Member] | Non-performing
2020
Total	123	123
2019
Total	900	900
2018
Total	2,836	2,836
2017
Total	19,164	19,164
2016
Total	1,267	1,267
Prior
Total	24,620	24,620
Revolving Loans Amortized Cost Basis
Total	8,786	8,786
Total
Total	58,025	58,025
Gross loans			$ 50,888
Percentage of total loans rated			1.00%
Payment Activity, Aging Status [Member] | Real-estate - home equity
2020
Total	21,247	21,247
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2019
Total	8,297	8,297
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2018
Total	14,726	14,726
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2017
Total	12,320	12,320
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2016
Total	13,231	13,231
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Prior
Total	142,499	142,499
Current period gross charge-offs		0
Current period recoveries		123
Total net (charge-offs) recoveries		123
Revolving Loans Amortized Cost Basis
Total	1,004,575	1,004,575
Current period gross charge-offs		(1,137)
Current period recoveries		182
Total net (charge-offs) recoveries		(955)
Total
Total	1,222,709	1,222,709
Current period gross charge-offs		(1,137)
Current period recoveries		305
Total net (charge-offs) recoveries		832
Gross loans			$ 1,314,944
Payment Activity, Aging Status [Member] | Real-estate - home equity | Performing
2020
Total	21,247	21,247
2019
Total	8,297	8,297
2018
Total	14,573	14,573
2017
Total	12,064	12,064
2016
Total	13,006	13,006
Prior
Total	140,145	140,145
Revolving Loans Amortized Cost Basis
Total	995,811	995,811
Total
Total	1,210,628	1,210,628
Gross loans			1,292,035
Payment Activity, Aging Status [Member] | Real-estate - home equity | Delinquent
Total
Gross loans			12,341
Payment Activity, Aging Status [Member] | Real-estate - home equity | Non-performing
2020
Total	0	0
2019
Total	0	0
2018
Total	153	153
2017
Total	256	256
2016
Total	225	225
Prior
Total	2,354	2,354
Revolving Loans Amortized Cost Basis
Total	8,764	8,764
Total
Total	12,081	12,081
Gross loans			10,568
Payment Activity, Aging Status [Member] | Real estate - residential mortgage
2020
Total	953,063	953,063
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2019
Total	650,307	650,307
Current period gross charge-offs		(68)
Current period recoveries		0
Total net (charge-offs) recoveries		(68)
2018
Total	271,246	271,246
Current period gross charge-offs		(101)
Current period recoveries		13
Total net (charge-offs) recoveries		(88)
2017
Total	385,956	385,956
Current period gross charge-offs		(190)
Current period recoveries		1
Total net (charge-offs) recoveries		(189)
2016
Total	294,728	294,728
Current period gross charge-offs		(7)
Current period recoveries		0
Total net (charge-offs) recoveries		(7)
Prior
Total	506,535	506,535
Current period gross charge-offs		(254)
Current period recoveries		278
Total net (charge-offs) recoveries		24
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Total
Total	3,061,835	3,061,835
Current period gross charge-offs		(620)
Current period recoveries		292
Total net (charge-offs) recoveries		328
Gross loans			2,641,465
Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Performing
2020
Total	953,063	953,063
2019
Total	649,475	649,475
2018
Total	268,809	268,809
2017
Total	383,345	383,345
2016
Total	294,005	294,005
Prior
Total	484,717	484,717
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	3,033,414	3,033,414
Gross loans			2,584,763
Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Delinquent
Total
Gross loans			34,291
Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Non-performing
2020
Total	0	0
2019
Total	832	832
2018
Total	2,437	2,437
2017
Total	2,611	2,611
2016
Total	723	723
Prior
Total	21,818	21,818
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	28,421	28,421
Gross loans			22,411
Payment Activity, Aging Status [Member] | Consumer
2020
Total	93,331	93,331
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2019
Total	106,865	106,865
Current period gross charge-offs		(500)
Current period recoveries		48
Total net (charge-offs) recoveries		(452)
2018
Total	105,040	105,040
Current period gross charge-offs		(425)
Current period recoveries		148
Total net (charge-offs) recoveries		(277)
2017
Total	48,343	48,343
Current period gross charge-offs		(346)
Current period recoveries		116
Total net (charge-offs) recoveries		(230)
2016
Total	27,875	27,875
Current period gross charge-offs		(433)
Current period recoveries		177
Total net (charge-offs) recoveries		(256)
Prior
Total	38,481	38,481
Current period gross charge-offs		(642)
Current period recoveries		891
Total net (charge-offs) recoveries		249
Revolving Loans Amortized Cost Basis
Total	49,616	49,616
Current period gross charge-offs		(442)
Current period recoveries		101
Total net (charge-offs) recoveries		(341)
Total
Total	469,551	469,551
Current period gross charge-offs		(2,788)
Current period recoveries		1,481
Total net (charge-offs) recoveries		1,307
Gross loans			463,164
Payment Activity, Aging Status [Member] | Consumer | Performing
2020
Total	93,208	93,208
2019
Total	106,797	106,797
2018
Total	104,984	104,984
2017
Total	48,281	48,281
2016
Total	27,828	27,828
Prior
Total	38,319	38,319
Revolving Loans Amortized Cost Basis
Total	49,594	49,594
Total
Total	469,011	469,011
Gross loans			457,556
Payment Activity, Aging Status [Member] | Consumer | Delinquent
Total
Gross loans			5,150
Payment Activity, Aging Status [Member] | Consumer | Non-performing
2020
Total	123	123
2019
Total	68	68
2018
Total	56	56
2017
Total	62	62
2016
Total	47	47
Prior
Total	162	162
Revolving Loans Amortized Cost Basis
Total	22	22
Total
Total	540	540
Gross loans			458
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts
2020
Total	69,512	69,512
Current period gross charge-offs		(1,463)
Current period recoveries		187
Total net (charge-offs) recoveries		(1,276)
2019
Total	71,629	71,629
Current period gross charge-offs		(241)
Current period recoveries		136
Total net (charge-offs) recoveries		(105)
2018
Total	53,923	53,923
Current period gross charge-offs		0
Current period recoveries		17
Total net (charge-offs) recoveries		17
2017
Total	55,942	55,942
Current period gross charge-offs		0
Current period recoveries		16
Total net (charge-offs) recoveries		16
2016
Total	18,753	18,753
Current period gross charge-offs		0
Current period recoveries		9
Total net (charge-offs) recoveries		9
Prior
Total	6,505	6,505
Current period gross charge-offs		0
Current period recoveries		20
Total net (charge-offs) recoveries		20
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Total
Total	276,264	276,264
Current period gross charge-offs		(1,704)
Current period recoveries		385
Total net (charge-offs) recoveries		1,319
Gross loans			299,397
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Performing
2020
Total	69,512	69,512
2019
Total	71,629	71,629
2018
Total	53,733	53,733
2017
Total	39,888	39,888
2016
Total	18,481	18,481
Prior
Total	6,219	6,219
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	259,462	259,462
Gross loans			278,743
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Delinquent
Total
Gross loans			4,012
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Non-performing
2020
Total	0	0
2019
Total	0	0
2018
Total	190	190
2017
Total	16,054	16,054
2016
Total	272	272
Prior
Total	286	286
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	16,802	16,802
Gross loans			16,642
Payment Activity, Aging Status [Member] | Construction - other
2020
Total	45,386	45,386
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2019
Total	36,764	36,764
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2018
Total	6,614	6,614
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2017
Total	181	181
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2016
Total	16	16
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Prior
Total	0	0
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Revolving Loans Amortized Cost Basis
Total	17,940	17,940
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Total
Total	106,901	106,901
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Gross loans			94,353
Payment Activity, Aging Status [Member] | Construction - other | Performing
2020
Total	45,386	45,386
2019
Total	36,764	36,764
2018
Total	6,614	6,614
2017
Total	0	0
2016
Total	16	16
Prior
Total	0	0
Revolving Loans Amortized Cost Basis
Total	17,940	17,940
Total
Total	106,720	106,720
Gross loans			92,649
Payment Activity, Aging Status [Member] | Construction - other | Delinquent
Total
Gross loans			895
Payment Activity, Aging Status [Member] | Construction - other | Non-performing
2020
Total	0	0
2019
Total	0	0
2018
Total	0	0
2017
Total	181	181
2016
Total	0	0
Prior
Total	0	0
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	181	181
Gross loans			809
Payment Activity, Aging Status [Member] | Consumer
Total
Gross loans			64,237
Payment Activity, Aging Status [Member] | Consumer | Performing
Total
Gross loans			63,582
Payment Activity, Aging Status [Member] | Consumer | Delinquent
Total
Gross loans			465
Payment Activity, Aging Status [Member] | Consumer | Non-performing
Total
Gross loans			190
Payment Activity, Aging Status [Member] | Consumer - indirect
Total
Gross loans			398,927
Payment Activity, Aging Status [Member] | Consumer - indirect | Performing
Total
Gross loans			393,974
Payment Activity, Aging Status [Member] | Consumer - indirect | Delinquent
Total
Gross loans			4,685
Payment Activity, Aging Status [Member] | Consumer - indirect | Non-performing
Total
Gross loans			$ 268
Portfolio Segment and Loan Class [Member]
2020
Total	3,312,351	3,312,351
2019
Total	1,749,487	1,749,487
2018
Total	1,375,338	1,375,338
2017
Total	1,313,813	1,313,813
2016
Total	1,223,009	1,223,009
Prior
Total	3,426,814	3,426,814
Revolving Loans Amortized Cost Basis
Total	1,513,024	1,513,024
Total
Total	13,915,117	13,915,117
Portfolio Segment and Loan Class [Member] | Pass
2020
Total	3,206,799	3,206,799
2019
Total	1,718,106	1,718,106
2018
Total	1,318,938	1,318,938
2017
Total	1,218,418	1,218,418
2016
Total	1,132,302	1,132,302
Prior
Total	3,131,383	3,131,383
Revolving Loans Amortized Cost Basis
Total	1,392,473	1,392,473
Total
Total	13,118,746	13,118,746
Portfolio Segment and Loan Class [Member] | Special Mention
2020
Total	65,450	65,450
2019
Total	27,399	27,399
2018
Total	26,916	26,916
2017
Total	44,131	44,131
2016
Total	67,150	67,150
Prior
Total	175,857	175,857
Revolving Loans Amortized Cost Basis
Total	54,175	54,175
Total
Total	461,078	461,078
Portfolio Segment and Loan Class [Member] | Substandard or Lower
2020
Total	40,102	40,102
2019
Total	3,982	3,982
2018
Total	29,484	29,484
2017
Total	51,264	51,264
2016
Total	23,557	23,557
Prior
Total	119,574	119,574
Revolving Loans Amortized Cost Basis
Total	66,376	66,376
Total
Total	335,293	335,293
Portfolio Segment and Loan Class [Member] | Real estate - construction(1)
2020
Total	94,758	94,758
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2019
Total	244,303	244,303
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2018
Total	196,393	196,393
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2017
Total	138,308	138,308
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2016
Total	52,178	52,178
Current period gross charge-offs		0
Current period recoveries		68
Total net (charge-offs) recoveries		68
Prior
Total	126,156	126,156
Current period gross charge-offs		(17)
Current period recoveries		4,875
Total net (charge-offs) recoveries		4,858
Revolving Loans Amortized Cost Basis
Total	48,537	48,537
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Total
Total	900,633	900,633
Current period gross charge-offs		(17)
Current period recoveries		4,943
Total net (charge-offs) recoveries		4,926
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Pass
2020
Total	94,758	94,758
2019
Total	243,614	243,614
2018
Total	196,393	196,393
2017
Total	138,308	138,308
2016
Total	44,315	44,315
Prior
Total	114,228	114,228
Revolving Loans Amortized Cost Basis
Total	47,594	47,594
Total
Total	879,210	879,210
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Special Mention
2020
Total	0	0
2019
Total	241	241
2018
Total	0	0
2017
Total	0	0
2016
Total	7,103	7,103
Prior
Total	6,106	6,106
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	13,450	13,450
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Substandard or Lower
2020
Total	0	0
2019
Total	448	448
2018
Total	0	0
2017
Total	0	0
2016
Total	760	760
Prior
Total	5,822	5,822
Revolving Loans Amortized Cost Basis
Total	943	943
Total
Total	7,973	7,973
Portfolio Segment and Loan Class [Member] | Commercial and industrial
2020
Total	2,500,459	2,500,459
Current period gross charge-offs		0
Current period recoveries
Total net (charge-offs) recoveries		0
2019
Total	555,271	555,271
Current period gross charge-offs		(106)
Current period recoveries		39
Total net (charge-offs) recoveries		(67)
2018
Total	353,953	353,953
Current period gross charge-offs		(10)
Current period recoveries		364
Total net (charge-offs) recoveries		354
2017
Total	251,867	251,867
Current period gross charge-offs		(102)
Current period recoveries		207
Total net (charge-offs) recoveries		105
2016
Total	243,343	243,343
Current period gross charge-offs		(388)
Current period recoveries		91
Total net (charge-offs) recoveries		(297)
Prior
Total	690,782	690,782
Current period gross charge-offs		(117)
Current period recoveries		1,704
Total net (charge-offs) recoveries		1,587
Revolving Loans Amortized Cost Basis
Total	1,371,525	1,371,525
Current period gross charge-offs		(16,625)
Current period recoveries		4,410
Total net (charge-offs) recoveries		(12,215)
Total
Total	5,968,154	5,968,154
Current period gross charge-offs		(17,348)
Current period recoveries		6,815
Total net (charge-offs) recoveries		10,533
Portfolio Segment and Loan Class [Member] | Commercial and industrial | Pass
2020
Total	2,409,273	2,409,273
2019
Total	540,493	540,493
2018
Total	330,516	330,516
2017
Total	229,184	229,184
2016
Total	216,228	216,228
Prior
Total	635,782	635,782
Revolving Loans Amortized Cost Basis
Total	1,256,763	1,256,763
Total
Total	5,618,239	5,618,239
Portfolio Segment and Loan Class [Member] | Commercial and industrial | Special Mention
2020
Total	52,203	52,203
2019
Total	13,653	13,653
2018
Total	7,618	7,618
2017
Total	10,886	10,886
2016
Total	13,693	13,693
Prior
Total	29,919	29,919
Revolving Loans Amortized Cost Basis
Total	50,673	50,673
Total
Total	178,645	178,645
Portfolio Segment and Loan Class [Member] | Commercial and industrial | Substandard or Lower
2020
Total	38,983	38,983
2019
Total	1,125	1,125
2018
Total	15,819	15,819
2017
Total	11,797	11,797
2016
Total	13,422	13,422
Prior
Total	25,081	25,081
Revolving Loans Amortized Cost Basis
Total	64,089	64,089
Total
Total	171,270	171,270
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage
2020
Total	717,134	717,134
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
2019
Total	949,913	949,913
Current period gross charge-offs		(16)
Current period recoveries		0
Total net (charge-offs) recoveries		(16)
2018
Total	824,992	824,992
Current period gross charge-offs		(36)
Current period recoveries		0
Total net (charge-offs) recoveries		(36)
2017
Total	923,638	923,638
Current period gross charge-offs		(2,515)
Current period recoveries		0
Total net (charge-offs) recoveries		(2,515)
2016
Total	927,488	927,488
Current period gross charge-offs		(29)
Current period recoveries		1
Total net (charge-offs) recoveries		(28)
Prior
Total	2,609,876	2,609,876
Current period gross charge-offs		(1,312)
Current period recoveries		438
Total net (charge-offs) recoveries		(874)
Revolving Loans Amortized Cost Basis
Total	92,962	92,962
Current period gross charge-offs		(17)
Current period recoveries		0
Total net (charge-offs) recoveries		(17)
Total
Total	7,046,330	7,046,330
Current period gross charge-offs		(3,925)
Current period recoveries		439
Total net (charge-offs) recoveries		3,486
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Pass
2020
Total	702,768	702,768
2019
Total	933,999	933,999
2018
Total	792,029	792,029
2017
Total	850,926	850,926
2016
Total	871,759	871,759
Prior
Total	2,381,373	2,381,373
Revolving Loans Amortized Cost Basis
Total	88,116	88,116
Total
Total	6,621,297	6,621,297
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Special Mention
2020
Total	13,247	13,247
2019
Total	13,505	13,505
2018
Total	19,298	19,298
2017
Total	33,245	33,245
2016
Total	46,354	46,354
Prior
Total	139,832	139,832
Revolving Loans Amortized Cost Basis
Total	3,502	3,502
Total
Total	268,983	268,983
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Substandard or Lower
2020
Total	1,119	1,119
2019
Total	2,409	2,409
2018
Total	13,665	13,665
2017
Total	39,467	39,467
2016
Total	9,375	9,375
Prior
Total	88,671	88,671
Revolving Loans Amortized Cost Basis
Total	1,344	1,344
Total
Total	156,050	156,050
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member]
Revolving Loans Amortized Cost Basis
Total	5,814	5,814
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Performing
Revolving Loans Amortized Cost Basis
Total	5,485	5,485
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Non-performing
Revolving Loans Amortized Cost Basis
Total	329	329
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity
Revolving Loans Amortized Cost Basis
Total	5,814	5,814
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity | Performing
Revolving Loans Amortized Cost Basis
Total	5,485	5,485
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity | Non-performing
Revolving Loans Amortized Cost Basis
Total	329	329
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Non-performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer | Performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer | Non-performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Non-performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other | Performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other | Non-performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member]
Revolving Loans Amortized Cost Basis
Total	1,281	1,281
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Pass
Revolving Loans Amortized Cost Basis
Total	327	327
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Special Mention
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	954	954
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1)
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Pass
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Special Mention
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial
Revolving Loans Amortized Cost Basis
Total	954	954
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial | Pass
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial | Special Mention
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	954	954
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage
Revolving Loans Amortized Cost Basis
Total	327	327
Current period gross charge-offs		0
Current period recoveries		0
Total net (charge-offs) recoveries		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Pass
Revolving Loans Amortized Cost Basis
Total	327	327
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Special Mention
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	$ 0	$ 0

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses Summary of Delinquency and Non-Performing Status by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Loans	$ 19,028,621	$ 16,837,526
Real-estate - home equity
Financing Receivable, Impaired [Line Items]
Loans	1,222,709	1,314,944
Real estate - residential mortgage
Financing Receivable, Impaired [Line Items]
Loans	3,061,835	2,641,465
Consumer
Financing Receivable, Impaired [Line Items]
Loans	469,551	463,164
Equipment lease financing, other and overdrafts
Financing Receivable, Impaired [Line Items]
Loans	$ 252,508	$ 299,397

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Non-accrual loans and leases	$ 128,321	$ 125,098
Loans and leases 90 days or more past due and still accruing	13,761	16,057
Total non-performing loans and leases	142,082	141,155
Other real estate owned (OREO)	4,565	6,831
Total non-performing assets	146,647	$ 147,986
Mortgage Loans in Process of Foreclosure, Amount	$ 9,600

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses Past Due Loan Status and Non-Accrual Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	$ 13,761	$ 16,057
Non- accrual	128,321	125,098
Current	18,845,238	16,620,575
Net Loans	19,028,621	16,837,526
Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	33,743	56,326
Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	7,558	19,470
Real estate - commercial mortgage
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	2,499	4,113
Non- accrual	40,926	33,166
Current	6,987,336	6,651,042
Net Loans	7,046,330	6,700,776
Real estate - commercial mortgage | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	11,867	10,912
Real estate - commercial mortgage | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	3,702	1,543
Commercial and industrial
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	1,950	1,385
Non- accrual	35,274	48,106
Current	5,924,376	4,392,278
Net Loans	5,968,154	4,446,701
Commercial and industrial | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	5,326	2,302
Commercial and industrial | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	1,228	2,630
Real-estate - home equity
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	3,070	3,564
Non- accrual	8,682	7,004
Current	1,206,089	1,292,035
Net Loans	1,222,709	1,314,944
Real-estate - home equity | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	3,966	9,635
Real-estate - home equity | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	902	2,706
Real estate - residential mortgage
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	3,394	5,735
Non- accrual	24,893	16,676
Current	3,021,682	2,584,763
Net Loans	3,061,835	2,641,465
Real estate - residential mortgage | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	10,686	26,982
Real estate - residential mortgage | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	1,180	7,309
Real-estate - construction
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	2,430	688
Non- accrual	1,621	3,618
Current	1,003,483	964,158
Net Loans	1,007,534	971,079
Real-estate - construction | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	0	1,715
Real-estate - construction | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	0	900
Consumer
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	306	458
Non- accrual	235	0
Current	466,926	457,556
Net Loans	469,551	463,164
Consumer | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	1,648	4,228
Consumer | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	436	922
Equipment lease financing, other and overdrafts
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	112	114
Non- accrual	16,690	16,528
Current	235,346	278,743
Net Loans	252,508	299,397
Equipment lease financing, other and overdrafts | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	250	552
Equipment lease financing, other and overdrafts | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	$ 110	$ 3,460

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses Loans Modified Under Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	$ 70,188	$ 55,150
Non-accrual TDRs (1)	37,025	20,825
Total TDRs	107,213	75,975
Loans and leases 90 days or more past due and still accruing	13,761	16,057
Financing Receivable, Nonaccrual	128,321	125,098
Financing Receivable, Not Past Due	18,845,238	16,620,575
Loans and Leases Receivable, Net of Deferred Income	19,028,621	16,837,526
Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases 90 days or more past due and still accruing	2,499	4,113
Financing Receivable, Nonaccrual	40,926	33,166
Financing Receivable, Not Past Due	6,987,336	6,651,042
Loans and Leases Receivable, Net of Deferred Income	7,046,330	6,700,776
Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	19,427	21,551
Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	28,558	13,330
Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	14,875	15,068
Loans and leases 90 days or more past due and still accruing	3,070	3,564
Financing Receivable, Nonaccrual	8,682	7,004
Financing Receivable, Not Past Due	1,206,089	1,292,035
Loans and Leases Receivable, Net of Deferred Income	1,222,709	1,314,944
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	7,328	5,193
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	0	8
Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Past Due	33,743	56,326
Financial Asset, 30 to 59 Days Past Due | Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Past Due	11,867	10,912
Financial Asset, 30 to 59 Days Past Due | Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Past Due	3,966	9,635
Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Past Due	7,558	19,470
Financial Asset, 60 to 89 Days Past Due | Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Past Due	3,702	1,543
Financial Asset, 60 to 89 Days Past Due | Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Past Due	$ 902	$ 2,706

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)loans	Sep. 30, 2019USD ($)loans	Sep. 30, 2020USD ($)loans	Sep. 30, 2019USD ($)loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	33	17	129	66
Post-Modification Recorded Investment | $	$ 14,189	$ 1,335	$ 43,577	$ 9,553
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	4	3	18	13
Post-Modification Recorded Investment | $	$ 3,021	$ 97	$ 4,399	$ 4,928
Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	5	1	12	1
Post-Modification Recorded Investment | $	$ 8,394	$ 81	$ 24,868	$ 81
Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	13	12	40	46
Post-Modification Recorded Investment | $	$ 1,370	$ 327	$ 3,556	$ 2,281
Real estate - residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	8	1	48	6
Post-Modification Recorded Investment | $	$ 1,351	$ 830	$ 10,516	$ 2,263
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	3	0	11	0
Post-Modification Recorded Investment | $	$ 53	$ 0	$ 238	$ 0

Loans and Allowance for Cred_14

Loans and Allowance for Credit Losses TDRs by Class Segment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)loans	Sep. 30, 2019USD ($)loans	Sep. 30, 2020USD ($)loans	Sep. 30, 2019USD ($)loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Recorded Investment | $	$ 14,189	$ 1,335	$ 43,577	$ 9,553
Number of Loans | loans	33	17	129	66
Real estate - residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Recorded Investment | $	$ 1,351	$ 830	$ 10,516	$ 2,263
Number of Loans | loans	8	1	48	6
Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Recorded Investment | $	$ 8,394	$ 81	$ 24,868	$ 81
Number of Loans | loans	5	1	12	1
Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Recorded Investment | $	$ 1,370	$ 327	$ 3,556	$ 2,281
Number of Loans | loans	13	12	40	46
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Recorded Investment | $	$ 3,021	$ 97	$ 4,399	$ 4,928
Number of Loans | loans	4	3	18	13
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Recorded Investment | $	$ 53	$ 0	$ 238	$ 0
Number of Loans | loans	3	0	11	0

Loans and Allowance for Cred_15

Loans and Allowance for Credit Losses Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans with principal balances approximately in percentage	93.00%	93.00%
Unpaid principal balance, with no related allowance	$ 65,689
Excluded from TDRs	3,800,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance of loans evaluated individually for impairment	1,000
Impaired loans balances, real estate as collateral	$ 1,000

Mortgage Servicing Rights Summa

Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Servicing Asset [Abstract]
Fair value of MSRs	$ 29,700		$ 29,700		$ 45,200
Residential Mortgage
Amortized Cost:
Balance at beginning of period	38,692	$ 38,826	39,267	$ 38,573
Originations of MSRs	4,319	2,499	8,569	5,585
Amortization	(4,129)	(1,970)	(8,954)	(4,803)
Balance at end of period	38,882	39,355	38,882	39,355
Servicing Asset [Abstract]
Beginning balance	7,700	0	0	0
Additions to valuation allowance	1,500	0	9,200	0
Ending balance	9,200	0	9,200	0
Net MSRs at end of period	29,682	39,355	29,682	39,355
Fair value of MSRs	$ 29,682	$ 43,968	$ 29,682	$ 43,968

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]
Mortgage Loans Serviced By For Third Parties	$ 4,800,000		$ 4,800,000			$ 4,900,000
Fair value of MSRs	29,700		29,700			45,200
Residential Mortgage
Servicing Asset at Amortized Cost [Line Items]
Fair value of MSRs	29,682	$ 43,968	29,682	$ 43,968
Additions to valuation allowance	1,500	0	9,200	0
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	$ 9,200	$ 0	$ 9,200	$ 0	$ 7,700	$ 0	$ 0	$ 0

Derivative Financial Instrume_3

Derivative Financial Instruments Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Foreign currency open position	$ 500		$ 500
Mortgage Loans Held For Sale [Member]
Derivative [Line Items]
Gain (loss) in fair values of mortgage loans held for sale	$ 658	$ 499	$ 2,800	$ 174

Derivative Financial Instrume_4

Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative asset, fair value	$ 375,909	$ 144,371
Derivative liability, gross liability	(183,249)	(76,067)
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	446,268	132,260
Derivative liability, notional amount	4,611	9,783
Derivative asset, fair value	11,994	1,123
Derivative liability, gross liability	(61)	(53)
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	0	75,000
Derivative liability, notional amount	414,110	180,000
Derivative asset, fair value	0	63
Derivative liability, gross liability	(1,644)	(371)
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	3,777,684	2,903,489
Derivative liability, notional amount	12,288	376,705
Derivative asset, fair value	375,567	143,484
Derivative liability, gross liability	(2)	(695)
Interest Rate Swap With Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	12,288	376,705
Derivative liability, notional amount	3,777,684	2,903,489
Derivative asset, fair value	2	695
Derivative liability, gross liability	(183,225)	(75,327)
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	2,947	3,373
Derivative liability, notional amount	5,885	7,283
Derivative asset, fair value	32	38
Derivative liability, gross liability	(280)	(154)
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	7,325	9,028
Derivative liability, notional amount	2,653	4,976
Derivative asset, fair value	340	192
Derivative liability, gross liability	$ (19)	$ (45)

Derivative Financial Instrume_5

Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ 1,796	$ 904	$ 9,639	$ 1,699
Mortgage Banking Derivatives [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	1,783	843	9,527	1,457
Interest Rate Swap [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	(12)	51	70	198
Foreign Exchange Contract [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ 25	$ 10	$ 42	$ 44

Derivative Financial Instrume_6

Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale	$ 93,621		$ 93,621		$ 37,828
Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	658	$ 499	2,800	$ 174
Cost [Member] | Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale	90,416		90,416		37,396
Fair value [Member] | Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale	$ 93,621		$ 93,621		$ 37,828

Derivative Financial Instrume_7

Derivative Financial Instruments Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Offsetting Assets [Line Items]
Derivative asset, fair value	$ 375,909	$ 144,371
Derivative, Collateral, Obligation to Return Securities	21	802
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	375,888	143,569
Derivative liability, gross liability	183,249	76,067
Derivative liability, Collateral, Right to Reclaim Securities	(21)	(802)
Derivative liability, Collateral, Right to Reclaim Cash	(183,228)	(75,265)
Derivative liability, Net Amount	0	0
Interest Rate Swap [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	375,569	144,179
Derivative, Collateral, Obligation to Return Securities	2	757
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	375,567	143,422
Derivative liability, gross liability	183,230	76,022
Derivative liability, Collateral, Right to Reclaim Securities	(2)	(757)
Derivative liability, Collateral, Right to Reclaim Cash	(183,228)	(75,265)
Derivative liability, Net Amount	0	0
Foreign Exchange Contract [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	340	192
Derivative, Collateral, Obligation to Return Securities	19	45
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	321	147
Derivative liability, gross liability	19	45
Derivative liability, Collateral, Right to Reclaim Securities	(19)	(45)
Derivative liability, Collateral, Right to Reclaim Cash	0	0
Derivative liability, Net Amount	$ 0	$ 0

Tax Credit Investments (Details

Tax Credit Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Affordable housing tax credit investment, net	$ 145,415		$ 145,415		$ 153,351
Other tax credit investments, net	70,379		70,379		64,354
Total TCIs, net	215,794		215,794		217,705
Unfunded affordable housing tax credit commitments	22,591		22,591		16,684
Other tax credit liabilities	60,585		60,585		55,105
Total unfunded tax credit commitments and liabilities	83,176		83,176		$ 71,789
Affordable housing tax credits and other tax benefits	(7,290)	$ (7,852)	(21,678)	$ (23,002)
Other tax credit investment credits and tax benefits	(1,240)	(1,136)	(3,122)	(3,407)
Amortization of affordable housing investments, net of tax benefit	5,024	5,649	15,071	16,638
Deferred tax expense	275	238	691	715
Total net reduction in income tax expense	(3,231)	(3,101)	(9,038)	(9,056)
Affordable housing tax credits investment	1,021	863	3,065	2,508
Other tax credit investment amortization	673	670	1,529	2,008
Total amortization of TCIs	$ 1,694	$ 1,533	$ 4,594	$ 4,516

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain on securities, before tax amount	$ 5,565	$ 23,150	$ 72,146	$ 81,207
Unrealized gain on securities, tax effect	(1,232)	(5,121)	(15,960)	(17,963)
Unrealized gain on securities, net of tax amount	4,333	18,029	56,186	63,244
Reclassification adjustment for securities gains included in net income, before tax amount	(2)	(4,492)	(3,053)	(4,733)
Reclassification adjustment for securities gains included in net income, tax effect	1	994	676	1,047
Reclassification adjustment for securities gains included in net income, net of tax amount	(1)	(3,498)	(2,377)	(3,686)
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To-Maturity, Before Tax	1,192	4,405	3,232	6,966
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To-Maturity, Tax	(264)	(974)	(715)	(1,541)
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To Maturity, After Tax	928	3,430	2,517	5,425
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, before tax amount				(875)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, tax effect				193
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, net of tax amount	0	0	0	(682)
Amortization of net unrecognized pension and postretirement items, before tax amount	329	357	984	1,083
Amortization of net unrecognized pension and postretirement items, tax effect	(73)	(80)	(219)	(240)
Amortization of net unrecognized pension and postretirement items, net of tax amount	255	277	765	843
Total Other Comprehensive Income, Before Tax Amount	7,083	23,419	73,309	83,648
Total Other Comprehensive Income, Tax Effect	(1,568)	(5,181)	(16,218)	(18,504)
Other Comprehensive Income	$ 5,515	$ 18,238	$ 57,091	65,144
Accounting Standards Update 2019-04
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Transfers From Available-For-Sale To Held-To-Maturity Securities, Before Tax				$ 3,700

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 2,340,501	$ 2,308,798	$ 2,342,176	$ 2,247,573
Ending Balance	2,390,261	2,324,016	2,390,261	2,324,016
Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	65,930	2,368	14,864	(44,654)
Other comprehensive income before reclassifications	4,333	18,029	56,186	63,244
Amounts reclassified from accumulated other comprehensive income	(1)	(3,498)	(2,377)	(3,686)
Ending Balance	71,190	20,329	71,190	20,329
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	0	(2)	0	680
Other comprehensive income before reclassifications	0	0	0	(682)
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Ending Balance	0	(2)	0	(2)
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(14,491)	(14,523)	(15,001)	(15,089)
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	255	277	765	843
Ending Balance	(14,236)	(14,246)	(14,236)	(14,246)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	51,439	(12,157)	(137)	(59,063)
Other comprehensive income before reclassifications	4,333	18,029	56,186	62,562
Amounts reclassified from accumulated other comprehensive income	254	(3,221)	(1,612)	(2,843)
Ending Balance	56,954	6,081	56,954	6,081
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income	928	3,430	2,517	5,425
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income	928	3,430	2,517	5,425
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Reclassification out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income	$ 0	$ 0	$ 0	$ 0

Fair Value Measurements Assets

Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 2,793,480	$ 2,497,537
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	2,793,480
Mortgages Held-for-sale, Fair Value Disclosure	93,621	37,828
Available-for-sale Securities, Fair Value Disclosure		2,497,537
Investments held in Rabbi Trust	21,828	22,213
Derivative assets	387,935	145,595
Assets, Fair Value Disclosure	3,296,864	2,703,173
Liabilities Held-In-Trust, Fair Value Disclosure	21,828	22,213
Derivative Liability	185,231	76,646
Total liabilities	207,059	98,859
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	926,554
Available-for-sale Securities, Fair Value Disclosure		652,927
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	926,554
Available-for-sale Securities, Fair Value Disclosure		652,927
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	342,558
Available-for-sale Securities, Fair Value Disclosure		377,357
Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	342,558
Available-for-sale Securities, Fair Value Disclosure		377,357
Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	532,473
Available-for-sale Securities, Fair Value Disclosure		693,718
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	532,473
Available-for-sale Securities, Fair Value Disclosure		693,718
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	321,695
Available-for-sale Securities, Fair Value Disclosure		177,312
Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	321,695
Available-for-sale Securities, Fair Value Disclosure		177,312
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	572,210
Available-for-sale Securities, Fair Value Disclosure		494,297
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	572,210
Available-for-sale Securities, Fair Value Disclosure		494,297
Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	97,990
Available-for-sale Securities, Fair Value Disclosure		101,926
Auction Rate Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	97,990
Available-for-sale Securities, Fair Value Disclosure		101,926
Single-issuer Trust Preferred Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	11,200
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Mortgages Held-for-sale, Fair Value Disclosure	0	0
Available-for-sale Securities, Fair Value Disclosure		0
Investments held in Rabbi Trust	21,828	22,213
Derivative assets	372	230
Assets, Fair Value Disclosure	22,200	22,443
Liabilities Held-In-Trust, Fair Value Disclosure	21,828	22,213
Derivative Liability	299	199
Total liabilities	22,127	22,412
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	2,695,490
Mortgages Held-for-sale, Fair Value Disclosure	93,621	37,828
Available-for-sale Securities, Fair Value Disclosure		2,393,211
Investments held in Rabbi Trust	0	0
Derivative assets	387,563	145,365
Assets, Fair Value Disclosure	3,176,674	2,576,404
Liabilities Held-In-Trust, Fair Value Disclosure	0	0
Derivative Liability	184,932	76,447
Total liabilities	184,932	76,447
Fair Value, Inputs, Level 2 [Member] | Other Corporate Debt [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	4,400	3,900
Fair Value, Inputs, Level 2 [Member] | Financial Institutions Subordinated Debt [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	338,200	362,300
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	926,554
Available-for-sale Securities, Fair Value Disclosure		652,927
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	342,558
Available-for-sale Securities, Fair Value Disclosure		374,957
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	532,473
Available-for-sale Securities, Fair Value Disclosure		693,718
Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	321,695
Available-for-sale Securities, Fair Value Disclosure		177,312
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	572,210
Available-for-sale Securities, Fair Value Disclosure		494,297
Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 2 [Member] | Single-issuer Trust Preferred Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	8,800
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	97,990
Mortgages Held-for-sale, Fair Value Disclosure	0	0
Available-for-sale Securities, Fair Value Disclosure		104,326
Investments held in Rabbi Trust	0	0
Derivative assets	0	0
Assets, Fair Value Disclosure	97,990	104,326
Liabilities Held-In-Trust, Fair Value Disclosure	0	0
Derivative Liability	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		2,400
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	97,990
Available-for-sale Securities, Fair Value Disclosure		101,926
Fair Value, Inputs, Level 3 [Member] | Single-issuer Trust Preferred Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 0	$ 2,400

Fair Value Measurements Changes

Fair Value Measurements Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - Fair Value, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 0	$ 0	$ 0	$ 875
Sales	0		0	(770)
Unrealized adjustment to fair value	0	0	0	(105)
(Premium amortization) discount accretion		0	0	0
Balance, end of period	0	0	0	0
Single-issuer Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	2,370	2,400	2,400
Sales	0		(2,160)	0
Unrealized adjustment to fair value	0	(2)	(242)	(32)
(Premium amortization) discount accretion		2	2	2
Balance, end of period	0	2,370	0	2,370
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	100,859	103,365	101,926	102,994
Sales	0		0	0
Unrealized adjustment to fair value	(2,869)	(67)	(3,936)	304
(Premium amortization) discount accretion		0	0	0
Balance, end of period	$ 97,990	$ 103,298	$ 97,990	$ 103,298

Fair Value Measurements Asset_2

Fair Value Measurements Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 4,565	$ 6,831
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans	113,073	144,807
OREO	4,565	6,831
MSRs (1)	29,682	45,193
Assets, Fair Value Disclosure	$ 147,320	$ 196,831

Fair Value Measurements Details

Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
AFS, at estimated fair value	$ 2,793,480	$ 2,497,537
HTM securities	324,940
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	1,534,890	517,791
FRB and FHLB stock	93,964	97,422
Loans held for sale	93,621	37,828
AFS, at estimated fair value	2,793,480	2,497,537
HTM securities	304,241	369,841
Net Loans	18,761,796	16,673,904
Accrued interest receivable	70,766	60,898
Other financial assets	694,442	431,565
Demand and savings deposits	17,997,443	14,327,453
Brokered deposits	317,588	264,531
Time deposits	2,415,020	2,801,930
Short-term borrowings	611,727	883,241
Accrued interest payable	9,123	8,834
Other financial liabilities	352,740	221,542
FHLB advances and long-term debt	1,296,012	881,769
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	1,534,890	517,791
FRB and FHLB stock	93,964	97,422
Loans held for sale	93,621	37,828
AFS, at estimated fair value	2,793,480	2,497,537
HTM securities	324,940	383,705
Net Loans	18,514,547	16,485,122
Accrued interest receivable	70,766	60,898
Other financial assets	694,442	431,565
Demand and savings deposits	17,997,443	14,327,453
Brokered deposits	317,588	264,531
Time deposits	2,442,422	2,828,988
Short-term borrowings	611,727	883,241
Accrued interest payable	9,123	8,834
Other financial liabilities	352,740	221,542
FHLB advances and long-term debt	1,342,192	878,385
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	1,534,890	517,791
FRB and FHLB stock	0	0
Loans held for sale	0	0
AFS, at estimated fair value	0	0
HTM securities	0	0
Net Loans	0	0
Accrued interest receivable	70,766	60,898
Other financial assets	272,632	234,176
Demand and savings deposits	17,997,443	14,327,453
Brokered deposits	275,719	223,982
Time deposits	0	0
Short-term borrowings	611,727	883,241
Accrued interest payable	9,123	8,834
Other financial liabilities	152,272	142,508
FHLB advances and long-term debt	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	0	0
FRB and FHLB stock	93,964	97,422
Loans held for sale	93,621	37,828
AFS, at estimated fair value	2,695,490	2,393,211
HTM securities	324,940	383,705
Net Loans	0	0
Accrued interest receivable	0	0
Other financial assets	387,563	145,365
Demand and savings deposits	0	0
Brokered deposits	41,869	40,549
Time deposits	2,442,422	2,828,988
Short-term borrowings	0	0
Accrued interest payable	0	0
Other financial liabilities	184,935	76,447
FHLB advances and long-term debt	1,342,192	878,385
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	0	0
FRB and FHLB stock	0	0
Loans held for sale	0	0
AFS, at estimated fair value	97,990	104,326
HTM securities	0	0
Net Loans	18,514,547	16,485,122
Accrued interest receivable	0	0
Other financial assets	34,247	52,024
Demand and savings deposits	0	0
Brokered deposits	0	0
Time deposits	0	0
Short-term borrowings	0	0
Accrued interest payable	0	0
Other financial liabilities	15,533	2,587
FHLB advances and long-term debt	$ 0	$ 0

Fair Value Measurements Narrati

Fair Value Measurements Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	$ 2,793,480	$ 2,497,537
Significant input, assumed market return to liquidity (years)	5 years
Other real estate owned (OREO)	$ 4,565	6,831
Common Class B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment owned, balance (in shares)	133
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average annual constant prepayment rate	17.70%
Weighted average discount rate	9.50%
Fair Value, Recurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	$ 2,793,480
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	2,695,490
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	97,990
Fair Value, Recurring [Member] | Financial Institutions Subordinated Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	338,200	362,300
Fair Value, Recurring [Member] | Single-issuer Trust Preferred Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	0	11,200
Fair Value, Recurring [Member] | Single-issuer Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	0	8,800
Fair Value, Recurring [Member] | Single-issuer Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	0	2,400
Fair Value, Recurring [Member] | Other Corporate Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	4,400	3,900
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other financial liabilities	299	199
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned (OREO)	4,565	6,831
Net MSRs at end of period	29,682	45,193
Foreign Exchange Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other financial assets	372	230
Forward Commitments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other financial assets	12,000	1,200
Other financial liabilities	1,700	424
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other financial assets	375,600	144,200
Other financial liabilities	$ 183,200	$ 76,000

Net Income Per Share Reconcilia

Net Income Per Share Reconciliation of Weighted Average Common Shares Outstanding (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average shares outstanding (basic) (in shares)	162,061	165,324	162,416	167,834
Impact of common stock equivalents (in shares)	518	802	667	888
Weighted average shares outstanding (diluted) (in shares)	162,579	166,126	163,083	168,722
Basic (in dollars per share)	$ 0.38	$ 0.38	$ 0.78	$ 1.06
Diluted (in dollars per share)	$ 0.38	$ 0.37	$ 0.78	$ 1.06

Stock-Based Compensation Compen

Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Compensation expense	$ 1,875	$ 2,110	$ 5,403	$ 5,458
Tax benefit	(397)	(451)	(1,144)	(1,194)
Stock-based compensation expense, net of tax benefit	$ 1,478	$ 1,659	$ 4,259	$ 4,264

Stock-Based Compensation Narrat

Stock-Based Compensation Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement [Line Items]
Compensation expense	$ 1,875	$ 2,110	$ 5,403	$ 5,458
Stock-based compensation expense, net of tax benefit	$ 1,478	$ 1,659	$ 4,259	$ 4,264
Directors' Plan [Member]
Statement [Line Items]
Shares reserved for future grants under the stock option and compensation plan	180		180
Employee Equity Plan [Member]
Statement [Line Items]
Awards vesting period (in years)			3 years
Shares reserved for future grants under the stock option and compensation plan	9,300		9,300

Employee Benefit Plans Summary

Employee Benefit Plans Summary of Pension Plan and Postretirement Plan Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 681	$ 813	$ 2,043	$ 2,443
Expected return on plan assets	(982)	(688)	(2,946)	(2,066)
Net amortization and deferral	465	496	1,395	1,486
Net periodic benefit	164	621	492	1,863
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	11	15	33	45
Net accretion and deferral	(137)	(139)	(411)	(417)
Net periodic benefit	$ (126)	$ (124)	$ (378)	$ (372)

Commitments and Contingencies O

Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	$ 8,325,169	$ 6,689,519
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	294,429	303,020
Commercial Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	$ 54,112	$ 50,432

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Sep. 28, 2020	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Settled Litigation
Loss Contingencies [Line Items]
Payments for legal settlements	$ 1.5
Residential Mortgage
Loss Contingencies [Line Items]
Valuation allowances and reserves, balance		$ 1.1		$ 3.2
Accounting Standards Update 2016-13 | Residential Mortgage
Loss Contingencies [Line Items]
Valuation allowances and reserves, balance			$ (2.1)

Long-Term Debt (Details)

Long-Term Debt (Details) - Subordinated Debt $ in Millions	Sep. 30, 2020USD ($)
3.25% Notes due 2030
Debt Instrument [Line Items]
Debt instrument, face amount	$ 200
Debt instrument, interest rate (as a percent)	3.25%
Debt instrument, effective rate (as a percent)	3.35%
3.75% Notes due 2035
Debt Instrument [Line Items]
Debt instrument, face amount	$ 175
Debt instrument, interest rate (as a percent)	3.75%
Debt instrument, effective rate (as a percent)	3.85%

Subsequent Event (Details)

Subsequent Event (Details) - Subsequent Event $ / shares in Units, $ in Millions	Oct. 29, 2020USD ($)$ / sharesshares
Depositary Shares
Subsequent Event [Line Items]
Equivalent of preferred shares (as a percent)	2.50%
Depositary Shares
Subsequent Event [Line Items]
Stock issued (in shares) | shares	8,000,000
Liquidation preference (in dollars per share) | $ / shares	$ 25
Series A Preferred Stock
Subsequent Event [Line Items]
Preferred stock, dividend rate (as a percent)	5.125%
Liquidation preference (in dollars per share) | $ / shares	$ 1,000
Aggregate offering amount | $	$ 200
Net proceeds from offering | $	$ 193.7

Uncategorized Items - fult-2020

Label	Element	Value
Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ (43,807,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ (43,807,000)